Force-guided (or positively-guided) relays have contacts that are
mechanically interlocked such that two contacts on the relays will not
contradict each other, even in the event that the relay welds. Force-guided
relays have contacts that are force-guided/mechanically linked conforming to
IEC60947-1-1 as required for use in safety-related control systems.
The mirror contact relays conform to EN 60947-4-1 by using a combination of the relay block and the auxiliary contact block.