Mitsubishi Electric C Series Handling And Maintenance page 46

(4) UVT (Under voltage trip)
(a) This device make it possilble to turn ON the circuit breaker after resetting manually when supply
voltage is recovered at least to 85% after dropping to 70 to 35% or lower and tripping the
breaker.
(b) Be sure to practice reset closing operation by applying the specified voltage to the coil of UVT.
(c) Refrain from reset closing operation of the circuit breaker without energizing the UVT as it
accelerates wear of the tripping latch and an cause failure.
(d) Be sure to set a small size NFB or fuses in the UVT circuit.
1 1 1 1 1 Coil rating of UVT
Type name of breaker
NF50-SRU, NF100-SRU/HRU
NV50-SRU, NV100-SRU/HRU
NF32-SW, NF63-CW/SW/HW, NF50-HCW
NF50-HRW
NF125-CW/SW/HW/RW/UW
NF250-CW/SW/HW/SEW/HEW/RW/UW
MB30-SW, MB50-CW/SW, MB100-SW
MB225-SW
NV32-SW, NV63-CW/SW/HW
NV125-CW/SW/HW/RW
NV250-CW/SW/HW/RW
MN50-CW/SW, MN100-SW, MN225-SW
NF-SFW/SJW/HJW
NF-SKW/SLW, NV-SKW
NF50-SWU, NF100-SWU, NF100-CWU, NF225-CWU
NV50-SWU, NV100-SWU, NV225-CWU
NF100-SEP/HEP
NF400-CW/SW/SEW/HEW/REW/UEW
NF630-CW/SW/SEW/HEW/REW
NF800-CEW/SDW/SEW/HEW/REW/UEW
NV400-CW/SW/SEW/HEW/REW
NV630-CW/SW/SEW/HEW
NV800-SEW/HEW
NF1000-SEW, NF1250-SEW/SDW, NF1200-UR
NF1600-SEW/SDW
NF2000-S, NF2500-S, NF3200-S, NF4000-S
Note 1. Manufacturing range of special voltage type differ by each model. Please enquire.
Note 2. The operating time is from non-voltage of the UVT to the start of main contact opening.
Note 3. Commonly used for both 50 Hz, and 60 Hz.
Note 4. ON operation without energizing closes the circuit breaker instantly and trips.
Note 5. Left-pole mounting
2 2 2 2 2 Composition of UVT
(a) NF32-SW to NF250-HEW
A UVT mechanical unit is incorporated in the circuit breaker, and a UVT voltage-control module is
attached outside. Lowered voltage is detected by the UVT voltage-control module, and the UVT
mechanical unit functions to trip.
The UVT voltage module is normally installed on the circuit breaker proper with lead wire terminal
block. A separate mount type can be produced uppon request.
The UVT voltage module is normally installed on the circuit breaker
proper.
Specifications
Reset
Resettable
prevention
type
type
− ○
− ○
○ −
○ (Note 4) −
− ○
○ (Note 4) △
○ △
(Note 4) (Note 5)
△ ○
△ ○
M3.5 terminal screw
UVT voltage module
Coil rating
Voltage V
Standard voltage Special Voltage (Note 1)
AC100-110 (Note 3)
110-127
200-220
220-240
380-415
400-440
DC24
100-110
(Note 3)
AC100-110/120-130 selectable AC24/48 selectable
200-220/230-250 selectable 500-550/600 selectable
380-415/440-480 selectable DC24/48 selectable
DC100/110 selectable 110/125 selectable
AC100-110/120-130 selectable
AC24/48 selectable
200-220/230-250 selectable
DC24/48 selectable
380-415/440-480 selectable
110/125 selectable
DC100/110 selectable (Note 3)
AC110-120
220-240
380-415
AC100-110
(Note 3)
440-480
200-220
500-550
400-440
DC24
DC100
48
110
AC100-120 AC24 (Note 3)
(Note 3)
200-240 48
380-450 440-480
DC100-110 500-550
60Hz AC110 50Hz AC100 AC120 (Note 3)
220 200 240
440 400 380
Circuit
breaker
UVT Voltage Module Wiring Diagram (Lead-wire Connection)
: Standard type
: Produce upon request
Operation time
Input
VA
(Note 2)
−
10 30 or less
(Note 3)
5 30 or less
(Note 3)
5 30 or less
(Note 3)
5 5~30
DC24
48
5 5~35
120-125
DC100
20 5~30
UVT voltage module
D3/P3
D1/P1
D2/P2
J1/UC1
J2/UC2
J1 UC1
／
J2 UC2
／
(ms)
44