Bosch relay -- which voltages?

Are you sure it isn't 20 A DC / 30 A AC?

--- Generally, the energized set is associated with the higher current, the reason being that the pressure generated between the normally-open contacts by the magnetic force attracting the armature will be greater than the pressure generated on the normally-closed set by the return spring.

-- JF

Usually the diff is in AC/DC applications. AC every so often passes zero voltage point so when opening a cirquit the spark is terminated. On DC you can have a very powerful welder in this occasion between contacts which can destoy them if used on exessive loads (currents).

HTH

Stanislaw.

Thanks to all who replied. Unfortunately, there does not appear to be a consensus, although the coil-pull response would appear to be the one with the most logical appeal.

Permit me to ask a follow up question:

Are Bosch-type relays made to be continuously energized? For example, could I use one that was energized by the vehicle's ignition circuit and which powered a number of appliances continuously as long as the ignition was on?

Ken C

I can't recall a relay that wasn't so designed. Latching relays may not be, and solenoids often aren't, but a relay with a limited duty cycle is an odd bird indeed.