Instantaneous relays

An Instantaneous Relay is one in which there is no time delay provided intentionally. As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value.

There is also some time required for mechanical movement of the armature in the relay. These time delays are inherent in the instantaneous relay but no other time delay is intentionally added. These relays can be operated in less than 0.1 sec.

Time Chart

Contacts change instantaneously from non-working position to working position when its coil is energized; when the coil is de-energized the contacts are coming back instantaneously to the initial non-working position.

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  303 relay – Safety critical, 19 contacts

  The 303 relay has 19 double break contacts in all N/O and N/C combinations. 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…
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  401 relay – Safety critical, 40 contacts

  The 401 relay has 40 double break contacts in all N/O and N/C combinations. 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. Weld no transfer safety contacts are standard. If one N/O contact welds, no…
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  A 400 relay – 4 contacts

  The A 400 relay has 4 double make / double break C/O contacts (form Z). 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 conforming the standards for Railway Transported Equipment. Positive mechanical keying of relay to socket is built into relay and socket during…
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  A 400 relay – 4 contacts

  The A 400 relay has 4 double make / double break C/O contacts (form Z). 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). (more…)
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  AG 400 relay – Gold plated, 4 contacts

  The AG 400 relay has 4 double make / double break C/O contacts (form Z). The contacts are gold plated on hard silver. This relay is used when dry circuits route to socket are not identified. 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…
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  AK 400 safety relay

  The AK 400 relay has 4 double make / double break C/O contacts (form Z). It is conform the French standard NF F 70-031 section 7.1.2. and 7.1.3. which specified no welding when contacts are closed on a 200 Amps 30 V short circuit protected by 6 A/400 V G1 fuse and no welding when contacts are closed on a 200 μF capacitor charged at 330 VDC. The resistance to…
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  AM 400 relay – Mixed load, 4 contacts

  The AM 400 relay has 3 silver double make / double break C/O contacts (form Z) and one gold bifurcated C/O contact. 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…
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  B 400 relay – Safety critical, 4 contacts

  The B 400 safety critical and heavy duty relay has 4 double make / double break C/O contacts (form Z). Weld no transfer safety contacts are standard. 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 conforming the standards for Railway Transported Equipment. Positive mechanical…
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  B 400 relay – Safety critical, 4 contacts

  The B 400 safety critical and heavy duty relay has 4 double make / double break C/O contacts (form Z). Weld no transfer safety contacts are standard. 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). (more…)
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  BG 400 relay – 4 gold contacts

  The BG 400 relay has 4 double make / double break C/O contacts (form Z). The contacts are gold plated on hart silver. This relay is used when dry circuits route to socket are not identified. 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…
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  BK 400 safety relay

  The BK 400 safety critical, heavy duty and weld resistant relay has 4 double make / double break C/O contacts (form Z). Weld no transfer and silver tin oxide safety contacts are standard. 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 conforming the standards…
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  BM 400 relay – Mixed load, 4 contacts

  The BM 400 relay has 3 silver double make / double break C/O contacts (form Z) and one gold bifurcated C/O contact. 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…
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  C relay – Safety critical, 9 contacts

  The C relay is an instantaneous and safety critical relay equipped with 9 double break contacts (Form X & Y - per customers specification) in all N/O and N/C combinations. 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 conforming the standards for Railway Transported…
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  CG relay – Safety critical, 9 contacts, gold plated

  The CG relay is an instantaneous and safety critical relay equipped with 9 double break contacts (Form X & Y - per customers specification) in all N/O and N/C combinations, gold plated. 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 conforming the standards for…
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  CK relay – safety critical, 9 contacts

  The CK safety critical, weld resistant and safety critical relay has 9 double break contacts (Form X & Y - per customers specification) in all NO and NC combinations. Weld no transfer and silver tin oxide safety contacts are standard. 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…
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  CM relay – 7 contacts and 2 gold contacts

  The CM relay is designed for combined power & dry circuit applications in diesel locomotives. Part number CM 045 72 37 S M is rated for 72 VDC nominal voltage and is configured with 4 N/C and 5 N/O double break contacts. Two of them (1 N/C & 1 N/O) are gold bifurcated contacts (dry circuit). All other contacts are in silver. On specific request, to provide for the large…