14 NEC TOKIN Sensors Vol.03
Zero-Phase Current Transformers ZCT
Outline
The ZCT Series of compact molded-type zero-phase
current transformers is ideal for improving the sensitiv-
ity, compactness and light weight of electric shock pre-
vention earth leakage breakers.
Applications
•Electric shock prevention earth
leakage breakers.
• Short circuit relays.
Shape and Dimensions
Features
•High sensitivity.
•Compact and light weight.
•Laminated iron core type.
Specifications
Spare solder
<5>
H LD3
[5.0]
D1
D2
H(5) A
D1
D3
B
D2
Pin
● MR-1,2,3,4 ● MR-1-P3,P5
Each part's dimensions (mm)
Product name D1 (±0.3) D2 (±0.3) D3 (±0.4) H L (±3.0) A (±0.3) B (±0.3)
MR-1 7.5 19.0 22.0 8.0±0.3 40.0 — —
MR-2 9.2 21.5 24.3 8.0±0.3 80.0 — —
MR-3 12.0 27.0 30.0 10.0±0.3 67.0 — —
MR-4 17.0 31.3 33.7 10.5±0.3 67.0 — —
MR-1-P3 7.7 19.0 21.0 8.5 max. — 3.0 10.0
MR-1-P5 7.7 19.0 21.5 8.5 max. — 5.0 10.5
Pin : 0.8
φ
solder-plated wire
MR-1 30
MR-2 30
MR-3 60 810±10 13 R=0.3 kΩ
MR-4 125 Io=22.5 mA
MR-1-P3 30
MR-1-P5 30
Note:)We can accommodate other specifications as well, so please ask if required. R : Output load, Io = Io : Detection current
Overload Temperature Unbalance Measurement
Product name Rated current Output voltage characteristics characteristics characteristics conditions
(–20°C to 80°C) (rated load)
(A) (mV) min. (%) max. (%) max. (%) max.
NEC TOKIN Sensors Vol.03 15
Before Using Zero-Phase Current Transformers ZCT
•Strong shocks such as from being dropped may change the characteristics. Take care to avoid any subjecting
the transformers to physical shocks.
