WEHRLE direct-current-relays are used for the switching of high currents with small control-wire diameters and voltage drops. They are used for numerous applications.
We would be happy to assist you in finding the correct relay.
Technical terms for relays:
- Pull-in voltage: Lowest value of the energizing voltage, by which the relay picks up.
- Drop-out voltage of a relay: Energizing voltage by which the relay reverts to stationary position.
- Nominal voltage: Voltage for which the relay is designed.
- Electrical service life: Number of operations with which the relay may be in service electrically.
- Continuous current: the current which a relay can carry with a given temperature.
- Contact consumption: Material loss of the contacts as a result of evaporation due to the influence of an electrical arc.
- Contact clearance: Clearance between the open contacts, measured at its narrowest point.
- Contact type:
- Contact voltage drop: Voltage drop between the relays connectors of the closed contact by a defined current power.
- Contact power: Power through which the contacts touch.
- Contact making material: WEHRLE offers relays in various contact making materials. Depending on the criteria, the following materials are available to WEHRLE: PdCu, AgNi, AgCuNi und AgSnO².
- PdCu: Suited for circuit pulsed operation. For example: Flasher Unit usage. Drawback: high contact voltage drop.
- AgNi/AgCuNi: Suited as a conduit for current and switch of ohmic and iductive loads for example: rear view mirror heating, motors and valves.
- AgSnO²: Suited for switching of capacitive and inductive loads. For example: H4 lamps, motors, glow plugs. Drawback: fluctuating contact voltage drops, through oxide.
- Break contact: Relays contact which is closed when the relay is in a resting position and open when it is in a working position.
- Contact-load voltage: Is the voltage between the contacts.
- Relays contact where in a resting position the relay is open and in the working position the relay is closed.
- Circuit of coil: Switching off results in induction voltage which may result in a disruption of the electrical system. In order to avoid or reduce this a circuit of the coil with a choice of resistor, diode or breakdown diode may be used. With this circuit, the switching time will be increased and as a result, the service life may be reduced. Therefore, it is necessary to examine the application.