Siemens SENTRON 3WL10 - Page 112

Accessories
3.2 Electromechanical accessories
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
110 Manual, 10/2018, L1V30499596002-01
Ready-to-close signaling switch (RTC)
The signaling contact for ready-to-close (RTC) is used to query whether the circuit breaker is
ready for closing. This signaling contact is always included in the scope of delivery of the
circuit breaker with a stored energy operating mechanism.
The following conditions must be met before the circuit breaker is ready to close:
● Circuit breaker in the OPEN position
● Springs charged
● Switch-off command or interlocking with switch-off command is not pending
● Circuit breaker reset due to tripping of the electronic trip unit ETU
Standard contact
Contact for digital signal
Type
Changeover contact
Changeover contact
Smallest load 100 mA at 24 V 1 mA at 5 V
Breaking capacity DC
24 V
—
0.1 A
250 V 0.5 A at 0 ms —
0.2 A at 10 ms
—
AC
250 V
3 A at cosφ 0.7
—
Spring charged signaling switch (S21)
The spring charged signaling switch (S21) signals the state of the operator closing springs of
the circuit breaker on the auxiliary conductor terminal system. This signaling switch is also
supplied if a circuit breaker is configured with a spring charging motor.
The contact is available in the standard version or in a version for digital signals.
Standard contact
Contact for digital signal
Type
Changeover contact
Changeover contact
Smallest load
100 mA at 24 V
1 mA at 5 V
Breaking capacity DC
24 V
—
0.1 A
125 V
0.3 A at 0 ms
—
250 V
0.15 A at 0 ms
—
AC 250 V
5 A at cosφ 1
—
5 A at cosφ 0.7
—
5 A at cosφ 0.3
—
400 V
3 A at cosφ 1
—
2 A at cosφ 0.7
—
1 A at cosφ 0.3
—
The signaling contact can only be operated in conjunction with the spring charging motor.