eaw develops, produces and distributes trusted and innovative relay technology for the automotive industry, energy suppliers, rail systems, mining, household appliances, heating, air-conditioning technology, and much more besides. We deliver p roducts that comply with established standards and develop special solutions both for and with our customers. Made in Germany to the highest quality.
From -60 to 390 degrees.
Thermal switches and sensors have to work in a fail-safe manner under any circumstances. Their natural operating environment includes cold, heat and humidity. Whether in laundry rooms, wind farms, freezers or ovens, from -60°C to +390°C, everything just clicks into place with eaw technology. Not only are their thermal switches and sensors small yet powerful up to 16 A, but they are also suitable for a range of uses and areas of application.
These thermal switches are used for monitoring/controlling temperature without an electricity supply. With a normally closed relay, the circuit is broken upon reaching a defined temperature threshold or temperature that is too low within a predefined temperature range. The jump to an open or closed thermal switch always depends on the temperature. The circuit closes automatically within a desired temperature range.
Temperature range -60°C to 200°C
Temperature range -60°C to 390°C
Temperature range -60°C to 200°C
The CS can be used for a rated voltage of 230 VAC to 16 A, in addition to rated voltages of up to 400 VAC / 16 A.
Degree of protection for the housing: IP 40
These thermal switches are used for monitoring/controlling temperature without an electricity supply. With a normally open relay, the circuit is connected upon reaching a defined temperature threshold or temperature that is too low within a predefined temperature range. The jump to an open or closed thermal switch always depends on the temperature. The circuit closes automatically within a desired temperature range.
Temperature range -60°C to 200°C
Temperature range -60°C to 390°C
Temperature range -60°C to 200°C
The CS can be used for a rated voltage of 230 VAC to 16 A, in addition to rated voltages of up to 400 VAC / 16 A.
Degree of protection for the housing: IP 40
These thermal switches are used for monitoring/controlling temperature without an electricity supply. Limiters are not subject to automatic resetting. With a limiter, the circuit opens upon reaching a defined temperature threshold or temperature that is too low within a predetermined temperature range. The thermal switch locks and is only ready to be used again following manual resetting.
Temperature range -60°C to 200°C
Temperature range -25°C to 120°C
Temperature range -60°C to 390°C
Degree of protection for the housing: IP 40
These thermal switches are used for monitoring/controlling temperature without an electricity supply. With a latcher, the circuit is broken upon reaching a defined temperature threshold or a temperature that is too low within a predefined temperature range. Temperature latchers prevent automatic resetting using a high-value resistance in parallel to the contact system. The circuit is closed only after disconnecting the voltage and a short cooling-off phase.
Temperature range -60°C to 200°C
Temperature range -60°C to 390°C
These thermal switches are used for monitoring/controlling temperature without an electricity supply. Changeovers are thermal switches with a changeover contact. With a changeover, the circuit is switched upon reaching a temperature that is too high or too low within a predefined temperature range. This type of thermal switch can typically be found as a form of ventilation control in fan ovens. Special models for specific applications are available on request.
Temperature range -60°C to 200°C
Fundamental for functionality and longevity.
The overheating protection mechanism in the coffee machine or the starting device on a fridge motor are everyday examples of how indispensable reliable thermal switches and sensors are. Operating safety in these situations is crucial to a long service life for the appliances and systems in which they have been installed. This includes a quality promise that premium products or brands must guarantee. With eaw, a large part of this has been incorporated right from the start.
PTC sensors are generally known as thermistors. They are made of materials that conduct electricity better at low temperatures than at high temperatures. Their electrical resistance increases as the temperature rises, which give them a positive temperature coefficient.
PTC thermistors are often used as alternatives to NTCs in the automotive industry. They can even be found in optimised manufacturing processes in aerospace technology, amongst other applications, on account of their high temperature coefficients. PTCs are also used for temperature compensation in electrical circuits.
eaw Relaistechnik offers the installation of NTC, PTC, KTY, PT100, PT500 or PT1000 thermistors within our trusted housing range for the ½-inch thermal switch series. With this solution, you have the option to replace traditional bimetallic thermostats with temperature sensors featuring NTC or PTC elements as thermistors immediately without having to change the design of your tools or your construction documentation.
PT sensors (platinum resistors) are PTC thermistors and belong to the group of PTC (positive temperature coefficient) sensors. They are predominantly used for taking temperature measurements with maximum accuracy, as their resistance has a virtually linear correlation with a rise in temperature. PT sensors are protected from both chemical and mechanical influences on account of their platinum coating, subsequent embedding and, in some cases, even their adaptation to specific applications.
Platinum sensors with a high rated resistance (such as PT1000) or 4-wire technology would be the ideal choice when using long connection cables.
eaw Relaistechnik offers the installation of NTC, PTC, KTY, PT100, PT500 or PT1000 thermistors within our trusted housing range for the ½-inch thermal switch series. With this solution, you have the option to replace traditional bimetallic thermostats with temperature sensors featuring NTC or PTC elements as thermistors immediately without having to change the design of your tools or your construction documentation.
The practical applications and temperature range are generally closely restricted and specified in the corresponding data sheet.
Platinum temperature sensors have been standardised with the ‘PT’ symbol and a rated resistance of R0 for a temperature of 0°C.
Due to their non-linear temperature resistant behaviour, KTY sensors are rather limited in their accuracy and must be calibrated with additional electronics for sufficient accuracy. As a result of this, the temperature range for KTY sensors is really quite modest.
The greatest disadvantage of KTY sensors is their sensitivity to electrostatic discharge (ESD).
The sensors can be slightly damaged by external voltage pulses. In contrast, the temperature coefficient of KTY sensors is around twice as high in comparison to PT100. The evaluable effective signal is less vulnerable to disturbances from the sensor environment. When using KTY sensors, it is important to note that these are polarised building elements.
eaw Relaistechnik offers the installation of NTC, PTC, KTY, PT100, PT500 or PT1000 thermistors within our trusted housing range for the ½-inch thermal switch series. With this solution, you have the option to replace traditional bimetallic thermostats with temperature sensors featuring NTC or PTC elements as thermistors immediately without having to change the design of your tools or your construction documentation.
The practical applications and temperature range are generally closely restricted and specified in the corresponding data sheet.
Platinum temperature sensors have been standardised with the ‘PT’ symbol and a rated resistance of R0 for a temperature of 0°C.
Basic types are further subdivided in terms of the level of the tolerance of the rated resistances as well as the position of the tolerance bandwidths.
NTC sensors are generally known as thermistors. They are made from materials that conduct electricity better at high temperatures than low temperatures. The electrical resistance decreases with rising temperature and has a negative temperature coefficient.
Thermistors are often used as an alternative to PTCs in the automotive sector. They can even be found in optimised manufacturing processes in aerospace technology, amongst other applications, on account of their high temperature coefficients. NTCs are also used for temperature compensation in electrical circuits. eaw Relaistechnik offers the installation of NTC, PTC, KTY, PT100, PT500 or PT1000 thermistors within our trusted housing range for the ½-inch thermal switch series. With this solution, you have the option to replace traditional bimetallic thermostats with temperature sensors featuring NTC or PTC elements as thermistors immediately without having to change the design of your tools or your construction documentation.
Rated value of an NTC sensor (by way of examples) provides its electrical resistance at 25°C.
Tolerance values of ±1.0 K to ±0.2 K can typically now be achieved in high-volume production processes.
Always on the safe side.
Operators of industrial plants, power plants and energy networks simply cannot afford any disruptions to their production or power supply. Having reliable switch relays in place helps to ensure things run as they should in a whole host of situations, and signal relays can even sound an alarm if necessary. eaw has 50 years of experience in this type of relay technology, and continues to provide an exceptional range of products that provide maximum support in safety-critical applications.
RELOG stands for a system of state-of-the-art electromechnical switch relays that meets the requirements of modern industrial control systems to a large extent in terms of its electric and structural parameters. The RELOG relay is used in industrial plants that require a reliable relay designed for long-term use. The wide variety of available models makes it possible to adapt to the majority of applications. This includes the available control voltage as well as contact designs and signalling options. The switching relays for the RELOG system are supplied in housings with a plug connection.
Complete with plug-in socket, adapter for top hat rail mounting or adapter for screw mounting
Slotted or solid plastic cap, metal cap
4 or 8 changeover contacts with single or twin contacts
Special models for rail vehicles with extended voltage range (UIC model)
Degree of protection: IP 40
Drop indicator or flag indicator Gold-plated contacts for switching the smallest loads Silver-palladium contacts for switching in adverse environmental conditions (such as sulphurous atmospheres) Retrofittable special cover for all 2RH models with closed cap to increase the degree of protection to IP 50
12 V to 220 V DC
12 V to 400 V AC
RELOG 2RH01s with forcibly guided contacts<
RELOG 2RH01i with increased ampacity (up to 10 A)
RELOG 2RH01f with reduced response time 15 ms
RELOG 4RH50 with dual coil
The relays in the RH series (RH04, RH32, RH33, RH34) can be used in plant engineering and control technology as switching relays based on a direct or alternating current. Thanks to the design type (closed housing construction), the RH32 is intended for use in challenging industrial applications (contaminant level 3). This design is to prevent the ambient air from reaching the cadmium-free contacts.
17.5 mm installation housing
Currents up to 16 A, also suitable for lamp loads
Integrated free-wheeling diode
Manual operation
Suitable for snapping onto 35 mm top hat rails
RH 4 - Switching relay operated by a direct current
RH 33 - Switching relay operated by alternating and direct current
The RH 33 is suitable for switching from smaller to bigger loads with appropriate prior knowledge of preloading.
22.5 mm top hat rail housing
Control with direct or alternating current, which also permits 16 2/3 Hz
Two powerful changeovers with currents up to 8 A
Direct current with up to 300 V
Housing: flame retardant, self-extinguishing polycarbonate according to UL94 VO
Temperature range from 40°C to 70°C
Five models for rated current range from 12 V to 230 V AC and 250 V DC
Varistors and free-wheeling diodes protect the relay on the input side and the connected devices on the input side protect the relay and connected devices
The RA70 is used for signalling and monitoring operating conditions, interruptions and faults in energy creation, distribution and almost all other industrial plants.
Examples include:
Operating conditions in plants or plant sections
Exceeding limits, for example temperatures or pressure
Faults caused by triggering protection devices for transformers, motors, and generators in generation and distribution plants
Voltage failures when monitoring control current circuits
The signal information (including faults, interruptions, and power outages) is saved until it has been acknowledged (manual operation of drop indicator) and the cause of the signal is rectified. The contacts activated by the signal relay for signal information can be used for visual and/or acoustic alarms or to control additional relays – for example, to switch off faulty devices. If required, a wiping contact can facilitate the control of an acknowledged switching current for the central signalling of faults or other signal information.
2 changeover contacts
1 changeover / 1 wiping contact
1 changeover / 1 direct changeover
1 changeover / 1 normally-open contact in middle position
1 wiping contact / 1 normally-open contact in middle position
Closed current
Operating current
Without acknowledgement
Diode suppressor circuit (only approx. 0.7 V DC)
Varistor suppressor circuit (DC/AC)
RC protective circuit (DC/AC)
RA70 with dual coil
Measuring relays are an excellent alternative to digital protection systems to minimise – or even rule out – not only the effects of electrical faults in switchboards, wiring or transformers, but also any risk to individuals. Measuring relays ensure quick and selective error detection and can potentially trigger a shutdown to facilitate the continued operation of uninterrupted networks. What’s more, applications with the corresponding scope of device technology can also still be implemented at a considerably lower cost.
Overvoltage/undervoltage relay Analogue or digital
Overcurrent/undercurrent relay Analogue / Digital
Earth-fault detection
Phase sequence relay
Three-phase undercurrent relay in delta or star connection
Potential isolating relay
Options
Time step
Drop indicator
LED
The electronic time relay of the 22.5 mm series can be used in all control technology for implementing time-delayed switching processes in starting, control and monitoring systems. This involves special single-grade, single-function and multi-grade multifunctional time relays.
Time relays with different functions are supplied for various voltages and time frames:
Response delay
Release delay with/without auxiliary voltage
Pulse on operate
Impulse generator 1:1 pause/pulse begin
Y – ∆ – switching
Multifunctional timer
The time relay is available in a range of versions
Release-delayed time relay ZO 70 & ZO 71
Time relay of type ZM (multifunctional timer)
Industrial time relay for DIN top hat rails
Mounting width: 22.5 mm
Wide voltage range 12–240 VUC
Terminal block with spring-loaded terminals(ZM99.2)
Terminal block with screw terminal(ZM99.3)
Additional functions, 2 time settings and 2 remote potentiometers 10 KΩ(ZM99 EF)
Connection of remote potentiometer 10 kΩ (ZM99 FP)
Industrial time relay for panel mounting
Installation size: 70 mm x 70 mm
Wide voltage range: 90–265 VUC
Parametrisation of six different functions:
Pick-up delay
Regression delay
Fleeting NO contact
Fleeting NC contact
Starting impulse generator pause
Starting impulse generator input
The MBAS 0600 alarm system provides a (visual) alarm of several signals (between 2 and 16 notifications depending on the model) in a compact housing. The MBAS 0600 can be installed in standardised door frames or switchboard panels. The alarm is signalled via bright, integrated LEDs behind snap-in red windows. An outgoing relay is also actuated at the same time, and this can be used to control a klaxon, for example. This outgoing relay serves as a collective notification. Remote operation of the devices includes inputs for acknowledging and muting the klaxon, as well as for testing and resetting the system.
Potential-free contact required for optical coupler inputs
Electrical isolation of all inputs and outputs
DIP switch for selecting the alarm program
Functional tests at push of a button
Self-monitoring of the controller
Summary of technical data
Auxiliary voltage depending on model (110 V UC, 230 VAC / 220 VDC, 60 VDC, 24 V / 48 VDC)
Power consumption/window between 1.5 and 2 VA
Inputs Internal power supply 12 V
Output contact voltage 240 VAC
Insulation (input outputs, input auxiliary voltage and output auxiliary voltage every 2 kV)
Ambient conditions of 0°C to 60°C
Storage temperature of 10°C to 70°C
Housing types
1D -> 72x144x215 (total) 68x138 (section of switchboard)
2D -> 144x144x215 (total) 138x138 (section of switchboard)
3D -> 216x144x215 (total) 210x138 (section of switchboard)
4D -> 288x144x215 (total) 282x138 (section of switchboard)
The control discrepancy switch is used not only to control the circuit breakers and disconnectors, but also to monitor and display its switch status in mimic diagrams and illuminated circuit diagrams that depict the switch front as a switch symbol. Once illuminated, this shows that the position of the control discrepancy switch does not correspond to the assigned circuit breaker. The control discrepancy switch may be used in the preselection circuit – i.e. the new switch position is preselected by changing the switch symbol in the mimic diagram. Only then is the switching command issued for the circuit breaker. The control discrepancy switch can also be used when first activated and once the new switch status has been acknowledged.
The discrepancy control switch is made up of a parcel counter with 9 switch levels, the control button complete with lighting mechanism, and a switch lock that has 2 staggered position settings of 90°. A further 45° rotation from these positions can also be made in the same direction; however, the switch button must be pressed. The switch then springs back to the respective 90° position when releasing the switch button. The 90° rotary switch is for acknowledgement (message switch) and the +45° turn/press switch for controlling (control switch).
Two models are available, both of which feature a square, black front panel that can also be removed depending on requirements. As for the control button design, this has been selected to fit in with the overall aesthetic of the switchboard.
Indicator switches are used as command switches not only for controlling switches, but also for monitoring and displaying their switch status in mimic diagrams and illuminated circuit diagrams for electrical systems. They can also be used to display the position of valves and pipe systems. The position of the assigned switch or valve is displayed by the control button. When the turn-switch button illuminates, this shows that the switching status of the assigned switch or valve no longer corresponds to the position of the indicator switch. As a result, the indicator switch is perfect for use in plants where the switching status is monitored independently from the switching point
The indicator switch is made up of a parcel counter with 3 changeovers, the control button complete with lighting mechanism, and a switch lock that has 2 staggered position settings of 90°. The illuminated control button is available in two designs. Both of these designs feature a square, black front panel that can also be removed depending on requirements. As for the control button design, this has been selected to fit in with the overall aesthetic of the switchboard.
Low-voltage switch gears
The sophisticated range from eaw Relaistechnik incorporates a broad spectrum of low-voltage switch gears, including powerful air-break contactors, auxiliary contactors, thermal overcurrent relays, condenser contactors and vacuum contactors.
All devices offer excellent operating safety levels and a long service life to ensure that the separation, protection and switching processes in every motor environment can function reliably.
General information
When separating contacts, sparks/switch arcs emerge – especially if an inductive load or direct current is activated. Electrical emissions are unavoidable as a result of the emerging contact erosion. Contactors have arcing or vacuum chambers in which arcs are slowly suppressed with the help of magnetic fields or fire-extinguishing devices (air, vacuum or noble gas).
Contactors have been specially designed to accommodate the frequent switching of three phase/asynchronous motors. They operate under the most extreme conditions, which include in mines, smelting works and wooden mills.
The “heavy-duty” air break contactors (ESü type) are particularly ideal for use in plants within the raw materials, metallurgy and chemical industries, in conveyor plants and ship building, and also in machine engineering applications on account of their design and exceptional reliability.
They are used for direct switching of all motor types in star-delta and reverse switch combinations for switching components including condensers and brake solenoids. Together with thermal overcurrent trip units, which are mounted separately, they can be used as motor protection switches.
High mechanical service life
Maximum safety under toughest operating conditions
High switching cycles
Suitable for use in 660 V three-phase current installations
Clear design
Minimum maintenance and monitoring required
No mechanical wear parts
Easy and quick to change electrical wear parts
Rated currents
100 A, 160 A, 250 A, 400 A, 630 A
Rated voltages
Rated size A:
500 VAC, 600 VDC
500 VAC, 600 VDC
660 VAC, 1 kV AC for basic switching conditions
The powerful ELSM and ELSK air-break contactors have been designed first and foremost for switching three-phase motors, electric ovens, and pumps, and for wiring electromagnets and condensers. The special ELSI design variant (installation protection) for building installations has been designed for use with ohmic and low-inductive loads.
Performance scope of three-phase motors
4 KW to 200 KW / 400 V AC
4 KW to 200 KW / 400 V AC
The devices correspond to the conditions of IEC 60947-4-1 and VDE 0660.
The contact system for a vacuum contactor is hermetically sealed and switches in a vacuum without affecting the environment. This prevents not only the occurrence of arcs and sparks, but also the influence of the ambient atmosphere on the contact pieces. The contact systems are actuated by electromagnetic drives. The EVS vacuum protection series is suitable for all applications that involve switching DC and AC loads.
They are used for direct switching operations in motors – particularly in AC 3 and AC 4 operation – for the development of star-delta combinations, for reversing mechanisms, and for rotor contactors.
High electrical life cycle in all utilisation categories
High dynamic limiting currents
High switching capacity
No influence on/by environment
Rated voltages up to 1000 V and rated currents of 160 A to 630 A. By switching the poles in parallel, rated currents of up to 1500 A can be achieved. The devices are suitable for all AC applications.
Compact 3-pole vacuum contactors for rated voltages of up to 1000 V and rated currents of 100 A to 300 A – suitable for all AC applications.
Electromechanical, robust, reliable.
eaw Relaistechnik presents an innovative product solution in the form of the eaw temperature controller, which works just as well in rough seas as it does in any other operating environment. The reliable electromechanical control unit monitors and controls the temperature of liquids with maximum precision and without any auxiliary voltage – fully automatically and fully autonomously. In all applications that call for low-maintenance continuous operation, the cost-effective bimetallic technology of eaw is particularly valuable. It has been tried and tested for decades and is now integrated into the compact temperature controller.
Product highlights.
Temperature recording/control using a two-point bimetallic controller Area of application from -10ºC to +240ºC Fully automatic, autonomous operation without auxiliary voltage Ideal for challenging operating conditions Operating voltage up to 400 VAC / 50 Hz No EMC influence External display of switching status optional Minimum hysteresis +/-5K between cut-off and cut-in temperature Cost-efficient, robust, reliable
Immersion heaters function as a low-maintenance controlled heating system with a two-point, bimetallic controller for operational temperature control of highly flammable liquids such as water and hydraulic oils. The temperature control unit works precisely and fully autonomously without auxiliary voltage.
Rated voltage 400 VAC (3 NPE)
Rated current consumption of up to 5A
Rated output 3500 W
Ambient temperature of 40°C to 55°C
Insertion/flat mounting
Rated insulation AC voltage 2.5 kV
The system is controlled by a thermal element, a two-point, bimetallic controller in combination with a power switch element (RELOG relay or air-break contactor).
Rated voltage 400 V AC
Rated frequency 50/60 Hz
Rated current 10 A
Switching frequency ≤ 3600 switching cycles/h
Service life for rated load ≥ 100,000 cycles
Switching function as “normally closed”
Opening temperature at 65°C ± 5K
Closing temperature at 25°C ± 5K
Ambient temperature of -40°C to 400°C
Rated insulation AC voltage 2.5 kV
Rated voltage 400 V AC ± 10%
Rated frequency 50/60 Hz
Rated consumption ≤ 3.0 VA
Max. switching voltage ≤ 250 V AC
Max. switching power 10 A AC
Max. permissible continuous current 5 A
Number of contacts: 4 changeovers
Switching frequency ≤ 3600 switching cycles/h
Mechanical service life ≥ switching cycles
Electrical service life ≥
Ambient temperature of -40°C to 55°C
Rated insulation AC voltage 2.5 kV
Rated impulse voltage 4 kV (voltage wave form 1.2/50 50 µs)
Durable and efficient.
The LFTR 1 functional test stand offers an application-based testing environment for thermal relays for
This is how eaw Relaistechnik ensures the quality of its own production and offers interested parties a test platform as a complete installation.
The LFTR 1 is used to determine the electrical life cycle with 100% monitoring of the functional safety of the thermal relay.
