Page 562 - Motor_protection_and_control_Manual_motor_starters_ contactors

RA4 interface relays

Description
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 AF09 ... AF96
contactors or the NF contactor relays. RA4 interface relay is made up of a miniature electromechanical
1SBC101065V0014 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.
Coil switching gives rise to overvoltages which have adverse effects on the electronic devices, insulators
RA4 and, more generally, on component lifetime. The RA4 is protected from surge thanks 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.
5 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.

Ordering details
For contactors Coil voltages Rated control circuit Type Order code Pkg Weight
(1) (2) voltage qty (1 pce)
Uc
V AC 50/60 Hz V DC kg
AF09 ... AF96 24 ... 250 24 RA4 1SBN060100R1000 1 0.040
NF RA4-T (3) 1SBN060100T1000 10 0.040
(1) LDC4 additional terminal blocks and CAT4 auxiliary contact blocks not suitable with RA4.
(2) Main use with contactor coils 41, 11, 12, 13.
(3) On request. Please contact your ABB local sales organization

Wiring diagram Main dimensions mm, inches
C
PLC
Output 44.8 1.76" 40 1.57"
- +
23 0.91"
Uc 24 V DC
A0 ≤250 V AC A2 E2- E1+
B
RA4
=
A
=
A1
KM1
A2
RA4 mounted on AF09 ... AF38 AF40 ... AF96
A 80 mm / 3.15" 119.5 mm / 4.70" 1SBC101060S0201
B 63 mm / 2.48" 83 mm / 3.27"
C 45 mm / 1.77" 40 mm / 1.57"

5/362 | ABB