Page 385 - ABB_Motor _Protection_and_Control_catalogue_20221216

ABB MOTOR PROTECTION AND CONTROL 3/309

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RA4 interface relays

RA4 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 03
AF09 ... AF96 contactors or the NF contactor relays. RA4 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.
1SBC101065V0014 The interface relay coil is controlled by the PLC while the N.O. contact ensures switching of the
power contactor.
Coil switching gives rise to overvoltages which have adverse effects on the electronic devices,
insulators and, more generally, on component lifetime. The RA4 is protected from surge thanks
RA4 to the built-in surge protection of AF09 ... AF96. Furthermore, the RA4 is protected against relay
pole reversal by a diode inserted between the E1 and E2 input terminals.
Connection
The "E1+" and "E2–" input terminals must be connected, according to their polarity, to the
PLC-output.
The RA4 is equipped with two terminal pads for connection to the A1 and A2 terminals of the
contactor coil.
This coil is supplied between the A0 and A2 terminals of the RA4.
Mounting
Remove the coil terminal block from the contactor and clip the interface relay without any
screwing operation.

For contactors Coil voltages Rated control circuit Type Order code Pkg Weight
(1) (2) voltage qty (1 pce)
Uc
V AC 50/60 Hz (4) V DC kg
AF09 ... AF96 24 ... 250 24 RA4 1SBN060100R1000 1 0.040
NF
(1) LDC4 additional terminal blocks and CAT4 auxiliary contact blocks not suitable with RA4.
(2) Main use with contactor coils 41, 11, 12, 13.

C
44.8 1.76" 40 1.57"
PLC
Output 23 0.91"
- +
B
Uc 24 V DC
A0 ≤250 V AC A2 E2- E1+ =
RA4 A
=

RA4 mounted on AF09 ... AF38 AF40 ... AF96
A1
A 80 mm / 3.15" 119.5 mm / 4.70"
KM1
A2 B 63 mm / 2.48" 83 mm / 3.27"
C 45 mm / 1.77" 40 mm / 1.57"
Wiring diagram Main dimensions mm, inches