Mitsubishi Electric C Series Handling And Maintenance page 45

(3) SHT (Shunt trip)
■ The device to trip circuit breakers electrically from a remote position.
■ Allowable operating voltage range is 70 to 110% of the rated voltage.
■ Coil rating (Standard)
Type designation of circuit breakers
32(30)·63A Frame
125A Frame
(NF125-SGW/HGW/RGW/UGW are excluded)
NF-C·S·H·U
MB
160·250A Frame
NF125-SGW/HGW/RGW/UGW
NF400-CW, NF400-SW, NF400-SEW, NF400-HEW, NF400-REW
NF400-UEW, NF400-ZCW, NF400-ZSW, NF400-ZEW
NF630-CW, NF630-SW, NF630-SEW, NF630-HEW
NF630-REW, NF630-ZCW, NF630-ZSW, NF630-ZEW
NF800-CEW, NF800-SDW, NF800-SEW, NF800-ZEW
NF800-HEW, NF800-REW, NF800-UEW
NV400-CW, NV400-SW, NV400-SEW, NV400-HEW, NV400-REW
NV630-CW, NV630-SW, NV630-SEW, NV630-HEW
NV800-SEW, NV800-HEW
NF1000-SEW, NF1250-SEW, NF1250-SDW
NF1600-SEW, NF1600-SDW
NF1250-UR
Cautionary instructions for use
Note 1. Use the appricable power supply capacity so that voltage drop by SHT operating current may not go down below
the allowable operating voltage range.
2. Operating time means the time from application of rated voltage to the SHT to the point when the main contact of
the circuit breaker opens.
3. 50 Hz and 60 Hz can be used commonly.
Remark 1. Design the control circuit so that the power supply of SHT is turned off after operation of SHT and before making
the circuit breaker again.
2. All the SHTs at present are with coil seizure preventing switch, but some old SHTs are of short time rating (30
sec) without any switch for coil seizure prevention. To those of short time rating, refrain fro zapplying voltage in
continuity.
3. Keep number of times of tripping lower than those shown below as SHT operation trips the circuit breaker.
4. Keep at the control voltage of SHT within the range of the rated voltage. Applying higher control circuit voltage
can cause breakage of the seizure preventing switch or of the circuit breaker itself. Applying lower control circuit
voltage can result failure of tripping, and breakage of the coil can cause when continuous low voltage is applied
to the SHT coil.
5. Provide the operation circuit of SHT with short-circuit protecting devices such as fuses.
6. Refrain from closing the circuit breaker while applying voltage to the SHT as it can make switching life of the
breaker shorter.
Number of operating cycle
(IEC60947-2)
Rated
current (A) With Without
current current
In≤100 1500 8500
100<In≤315 1000 7000
315<In≤630 1000 4000
630<In≤2500 500 2500
2500<In 500 1500
Remarks: Number of operation by the test button of earth leakage circuit
breakers is 1,000 times.
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Number of operation by
SHT, UVT, or trip button
Total
10000
10% of the total number of
8000
operations
5000
3000
2000
Voltage (Note 3)
Cut off switch
(V)
AC100-240
380-550
Equipped
(Compatible to 50 and 60Hz.)
DC100-125
Equipped AC100-450/DC100-200
AC100-120
200-240
Equipped
380-450
DC100
Input VA (Note 1)
Operating time
AC
DC (Note 2)
50
120 15 or less
60
100V 20
100V 10
200V 50
5~15
380V 120
200V 35
450V 170
200 70 7~15