Siemens 7SR10 Argus Series Manual page 282

Scheme 1 (Basic)
+
R
Scheme 1 provides full Trip supervision with the circuit breaker Open or Closed.
Where a 'Hand Reset' Trip contact is used measures must be taken to inhibit alarm indications after a CB trip.
Scheme 2 (Intermediate)
+
R
Scheme 2 provides continuous Trip Circuit Supervision of trip coil with the circuit breaker Open or Closed. It does
not provide pre-closing supervision of the connections and links between the tripping contacts and the circuit
breaker and may not therefore be suitable for some circuits which include an isolating link.
© 2018 Siemens Protection Devices Limited
BO
TRIP CCT n FAIL
BI
+ve -ve
BO 1 BO n
Remote
Alarm
Figure 5-6 Trip Circuit Supervision Scheme 1 (H5)
BO
TRIP CCT n FAIL
BI
+ve -ve
BO 1 BO n
Remote
Alarm
Figure 5-7 Trip Circuit Supervision Scheme 2 (H6)
7SR10, 7SR11, 7SR12 Applications Guide
52a
TRIP COIL
Circuit
R
Breaker
52b
H5 Scheme Notes:
BI = 19V DC (24, 48V DC supply)
BI = 44V, 88V (110, 220V AC/DC supply)
R = 3K3 typical
52a
TRIP COIL
52a
Circuit
Breaker
52b
H6 Scheme Notes:
BI =19V DC (24, 48V DC supply)
BI = 44V, 88V (110, 220V AC/DC supply)
R = 3K3 typical
Chapter 7 Page 38 of 41
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