31
New generation IZM97, 99 low voltage air circuit breaker instruction manual
MN013010EN February 2020 www.eaton.com.cn
Section 4: Accessory devices
Interlock type
No. of interlocked breakers
Interlock description
Feasible interlock logic
2 type
2 circuit breakers
1 for normal power supply (A), 1 for emergency supply
(B). It requires additional ropes.
AB
00
10
01
31 type
3 circuit breakers
2 for normal power supply (A &C), 1 for emergency
supply (B). If B breaks, circuit breaker A&C can still
turn off. B can turn off only when A&C breaks. It
requires 2 set of ropes.
ABC
000
100
010
001
101
32 type
3 circuit breakers
2 for normal power supply (A &C), 1 for emergency
supply (B). If B breaks, circuit breaker A&C can still
turn off. Among the 3 circuit breakers, 1 or 2 breakers
can turn off simultaneously. It requires 3 set of ropes.
ABC
000
100
010
001
110
011
101
33 type
3 circuit breakers
3 for normal power supply (A&B &C), or in the case of
emergency supply, only 1 circuit breaker can turn off.
It requires 3 set of ropes.
ABC
000
100
010
001
Table 4.6 Mechanical interlock description
