The SB is a latching safety critical relay with 2 stable
magnetically latched states. When 1 coil is energized, the
relay actuates from magnetically latched position 1 to 2.
When the other coil is energized, the relay actuates back
from magnetically latched position 2 to 1.
Two types of configuration are available:
| 400 type contact relays have 4 changeover double
break contacts (Form Z)
| 300 type contact relays have 3 changeover double
break contacts (Form Z) a 4th double break contact is
reserved for automatic coupling of the coils.
The plug-in design offers secure locking feature for
maximum ease of maintenance (no wires need to be
disconnected or other hardware removed for relay
inspection or replacement). The resistance to impact and
vibration is conform to standards in force for Railway
Transported Equipment.
Positive mechanical keying of relay to socket is built into
relay and socket during manufacture and terminal
identifications are clearly marked on identification plate that
is permanently attached to the relay.
