- 6 -
Table 7 Number of operation cycles
Shell frame level
rated current Inm
(A)
Number of
operation cycles
per hour
Number of operation cycles
Energizing
De-energizing
Total times
125
120
1,500
8,500
10,000
250
120
1,000
7,000
8,000
400
60
1,000
4,000
5,000
630
60
1,000
4,000
5,000
6. Electric operating mechanism
When the electric operating mechanism is used for the earth leakage circuit
breaker, reliable closing and opening of the circuit breaker shall be ensured
at any voltage between 85% and 110% of the rated control power supply
voltage.
7. Shunt trip
When the power supply voltage is equal to any voltage between 70% and
110% of the rated control power supply voltage, the circuit breaker can be
reliably interrupted by operating the shunt trip.
8. Undervoltage release
When the power supply voltage drops to 70% ~ 35% of the rated power
supply voltage, the undervoltage release shall act to interrupt the earth
leakage circuit breaker. When the power supply voltage is lower than 35%
of the rated power supply voltage, the undervoltage release shall prevent the
earth leakage circuit breaker from closing. When the power supply voltage is
equal to or greater than 85% of the rated power supply voltage, reliable
closing of the earth leakage circuit breaker shall be ensured.
9. LB earth leakage alarm module (see Figure 1)
The HYM1LB Earth Leakage Circuit Breaker is plugged with LB earth
leakage alarm module on the right side of the circuit breaker. Terminals P1-
P2 of this module are externally connected with AC 400 V or AC 230 V power
supply. When earth leakage occurs in the main circuit of the earth leakage
circuit breaker and IΔ ≥ IΔn, the earth leakage circuit breaker does not trip,
the relay in the alarm module acts, and the terminals S1, S2 and S3 are
internally connected with relay contacts to send out alarm signals.
Figure 1
Wiring diagram of the LB earth leakage alarm module
Where S2-S3 are normally-closed contacts and S1-S2 are normally-open
contacts:
A. When I
∆
＜
I
∆
n, the earth leakage indicator light is not on, and S2-S3 is
closed and S1-S2 is open.
LB earth
leakage
alarm
module
Contact
capacity
