Coupling Relays - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RT2 contactors/contactor assemblies
2.4 Configuration
2.4.8.4

Coupling relays

Applications
The coupling relays (24 V DC magnet coil) have been adapted to the specific demands
associated with system-compatible interaction with electronic controls, thanks to their
extended operating range and reduced coil power.
These are versions of the 3RT20/3RH21 contactor ranges, which are characterized by the
following features:
Coupling relay Size
version
3RH21 contactor S00
relay
3RT20 motor S00
contactor
S0
Note
The 3RT20/3RH21 coupling relays cannot be expanded by means of auxiliary switch blocks.
130
Wide voltage range of the magnet coil
0.7 ... 1.25 x U
S
Switch-on Order number
power = holding
power
3RH21..-.HB40
2.8 W at 24 V 
(without RC circuit)
3RH21..-.JB40

(with diode)
3RH21..-.KB40

(with suppressor
diode)
3RT201.-.H.
2.8 W at 24 V 
(without RC circuit)
3RT201.-.J.

(with diode)
3RT201.-.K.

(with suppressor
diode)
3RT202.-1KB40
4.5 W at 24 V 
(with varistor)
0.8 ... 1.85 x U
S
Switch-on Order number
power = holding
power
3RH21..-.MB40-0KT
1.6 W at 24 V 
0 (without RC circuit)
3RH21..-.VB40

(with diode)
3RH21..-.WB40

(with suppressor
diode)
3RT201.-.M.
1.8 W at 24 V 
(without RC circuit)
3RT201.-.V.

(with diode)
3RT201.-.S.

(with suppressor
diode)
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System Manual, 01/2011, A8E56203870002-03
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