Siemens Argus 7SR21 Technical Manual page 635

Scheme 2 (Intermediate)
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)
Scheme 3 provides full Trip supervision with the circuit breaker Open or Closed.
© 2013 Siemens Protection Devices Limited
Figure 5.4-2 Trip Circuit Supervision Scheme 2 (H6)
Figure 5.4-3 Trip Circuit Supervision Scheme 3 (H7)
7SR210 & 7SR220 Applications Guide
Page 41 of 48