AB marine service supplies mini relays 6V, 12V or 24V, time relays, high power relays 12V and 24V and a relay holder for a mini relay 12V.

For questions and advice, please contact us.

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Difference between mini relays and high-power relays

Mini relays are used for continuous nominal amperage. These relays do not tolerate peak voltage. High-power relays tolerate peak voltages, such as the switching on of a heavy electric motor.

Relays for nominal use

Relays for nominal use, such as for bow thrusters, are relays that are not continuously loaded.

Relays for continuous use

Relays for continuous use are suitable for continuous loads.

What is a relay?

A relay uses a relatively small current to switch a large or different current on or off. This prevents the use of thick cabling and unnecessary strain on contacts. It is actually a small switch that controls a larger switch. This is done with a magnetic coil and a contact.

Relays usually have four contacts:

  1. Small contact for control current 86 (+)
  2. Small contact for control current 85 (-)
  3. Switching contact 30
  4. Switching contact 87


Some relays have a diode in the coil. When the relay is switched off, the retracted coil is released. Due to the speed and sudden shutdown of the current, a peak voltage may be generated by the coil. With a normal switch, this does little harm and the voltage is dissipated. But in printed circuit boards and other sensitive equipment, it can cause damage or malfunction.



Changeover relays come with an additional 87A connection that is switched on or off depending on the type.


Relays for outboard engines and personal watercraft