Siemens SENTRON 3WL10 - Page 105

Tripped signaling switch via auxiliary release (S25)
The tripped signaling switch via auxiliary release (S25) signals tripping of the circuit breaker by
the shunt release or undervoltage release.
The tripped signaling switch via auxiliary release (S25) can only be used for 3VA27 molded
case circuit breakers with toggle.
Leading changeover switch (S26)
The leading changeover switch (S26) signals the closing of the main contacts (leading in the ON
direction) when the circuit breaker is opened.
The leading changeover switch (S26) can only be used for 3VA27 molded case circuit
breakers with handle.
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 mechanism.
The following conditions must be met before the circuit breaker is ready to close:
• Circuit breaker in the OPEN position
• Springs charged
• Switch-o󹪜 command or interlocking with switch-o󹪜 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 con󹪝gured 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
Accessories
3.2Electromechanical accessories
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
104 Equipment Manual, 10/2023, L1V30499596002-03