Page 598 - Motor_protection_and_control_Manual_motor_starters_ contactors

Interface relays

Description
1SBC101005F0014 RA5-1 interface relay is designed to receive 24 V DC signals delivered by PLC’s or other sources with a
low output power and to restore them with sufficient power to operate the coils of the relevant contactors.
RA5-1 interface relay is made up of a miniature electromechanical relay equipped with a N.O. contact and
with a low consumption 24 V DC coil.
The interface relay coil is controlled by the PLC while the N.O. contact ensures switching of the power
contactor.
RA5-1 Coil switching gives rise to overvoltages which have adverse effects on the electronic devices, insulators
and, more generally, on component lifetime. The RA5-1 is equipped with surge suppressors:
– on the 24 V DC relay coil via a diode,
– on the power contactor coil via a varistor.
Furthermore, the RA5-1 is protected against relay pole reversal by a diode inserted between the E1 and
E2 input terminals.

5 Ordering details
For contactors Coil voltages Rated control circuit Type Order code Pkg Weight
voltage qty (1 pce)
Uc
V 50/60 Hz V DC kg
UA, UA..RA 24...250 24 RA5-1 1SBN060300R1000 1 0.050
GA75 RA5-1 1SBN060300T1000 10 0.050

1SBC101528S0201 - Rev. B

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