7SR10, 7SR11, 7SR12 Applications Guide
© 2018 Siemens Protection Devices Limited
Chapter 7 Page 38 of 41
Scheme 1 (Basic)
R
BI
+ve
-ve
+
BO 1
BO n
Remote
Alarm
BO
R
TRIP COIL
52a
52b
-
Circuit
Breaker
H5 Scheme Notes:
BI = 19V DC (24, 48V DC supply)
BI = 44V, 88V (110, 220V AC/DC supply)
R = 3K3 typical
TRIP CCT n FAIL
Figure 5-6 Trip Circuit Supervision Scheme 1 (H5)
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)
TRIP COIL
52a
52a
52b
-
Circuit
Breaker
BI
+ve
-ve
+
BO 1
BO n
Remote
Alarm
BO
R
TRIP CCT n FAIL
H6 Scheme Notes:
BI =19V DC (24, 48V DC supply)
BI = 44V, 88V (110, 220V AC/DC supply)
R = 3K3 typical
Figure 5-7 Trip Circuit Supervision Scheme 2 (H6)
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.
Содержание 7SR10 Argus Series
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