The T2CBBU 400 is an asymetrical flasher relay with 4 double make / double break C/O contacts (form Z). The first period is adjusted 0.1 s...1.5 s and second period 1 s...15 s. Time delay is achieved by combination of relay dip switch The access to dip switch is available by removing time delay cover. This feature prohibits frivolous field time delay setting. Timing can be also be factory set on order.

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

The T2CBBU 400 relay is pluggable in the following sockets: EA 102 B, EA 102 BF, EA 103 BF, EA 104 B, EA 104 BF, EA 105 BF, EA 112 BF.