7SR18 Applications Guide
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Scheme 2 (Intermediate)
Figure 9.3.1-2 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.
Scheme 3 (Comprehensive)
Figure 9.3.1-3 Trip Circuit Supervision Scheme 3 (H7)
Scheme H7 provides full Trip supervision with the circuit breaker Open or Closed.
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