Instantaneous relay with high contact rating.

Relay pluggable on socket including a withdrawal clasp and two square guide pins which can ast as a key to ensure that the correct relay is used at the correct voltage.(see our withdrawal guide in the technical support pages of this site)

Recommended operating position : vertical coil axle/clapper upside or horizontal coil axle/contacts down.

Pluggable on front wiring socket (EVD) or rear wiring sockets (ER, ERB, ERDL).



Operation principle

This relay is equipped with 5 double cut-off CO contacts with self arc blowing, particularly adapted to high DC cut-off.

Minimum switching current :

* up to 12 V : not recommended
* 160 mA at 24 V
* 55 mA at 48 V
* 8 mA at 125 V
* 0,9 mA at 220 V
* 0,1 mA at 380 V

Technical features

Function Instantaneous
Presentation under cover
Connection on front or rear wiring socket
Number of mechanical operations 50.000.000
Operating temperature - 5??C to + 40??C
Storage temperature - 40??C to + 70??C
Climatic protection optional reinforced climatic protection
Shock voltage 5 KV (wave 1,2/50 ??s)
Dielectric strength 2500 V eff
Insulation resistance C500 (according to NFC 45-202 & VDE 0110)
Weight 300 g.
Protection level IP 40 (according to NFC 20-010)

Coil data

  Direct current Alternative current
Min. nominal voltage DC 6 V 6 V
Min. nominal voltage AC 220 V 380 V - 50/60 Hz.
Operating range -20/+10% of nominal voltage
Power requirement 3 W +/- 10% 14 VA +/- 20% 7,5 VA +/- 20%


Number of contacts 4
Max. load current 10 A per contact
Response time (bounce time not included) DC < 36 ms - AC < 31 ms

Contacts rating

connection on DC


BA72: DC versions

BA88: AC versions



Other versions:


. Relay BA with reinforced climatic protection
. Relay BA with specific characteristics upon request
. Relay BA UIC (for SNCF use)

. BA intensity relay (for DC)

Homologations & conformities :

* CEI 255-1-00
* NFC 45-250