OUVT-X3 Over-under Voltage Release

OUVT X3 Accessories (Final Power Distribution)

OUVT X3 Accessories (Final Power Distribution) 1P Front

OUVT X3 Accessories (Final Power Distribution)

OUVT X3 Accessories (Final Power Distribution) 1P Front

OUVT-X3 Over-under Voltage Release

The OUVT-X3 Over/Under Voltage Release is designed to provide reliable over-voltage and under-voltage protection when assembled with NXB-125 series circuit breakers. Operating at AC240V, 50Hz, it trips the circuit breaker when voltage exceeds or falls below safe limits, ensuring system safety and stability. Compact and easy to mount on a TH35-7.5 rail, it delivers precise voltage monitoring and long mechanical life for modern low-voltage protection applications.

Product Information

Function: Provides over- and under-voltage protection when paired with NXB-125 series MCBs
Rated Operational Voltage (Ue): AC240V, 50Hz
Overvoltage Operation Setting (Uvo): 280V
Rated Insulation Voltage (Ui): 500V
Tripping Characteristics:
- Trips when voltage decreases to ≤35% of Ue or increases to 95%–105% of the over-voltage setting value.
- Prevents the breaker from closing when voltage is below 35% Ue or above 105% of the over-voltage setting value.
- Allows normal operation when supply voltage is 85% Ue to 95% of the over-voltage setting.
- The upper voltage limit should not exceed 110% of the over-voltage setting.
Mechanical and Electrical Life: 4000 cycles total (500 cycles each for over-voltage and under-voltage trip; 3000 cycles for open/close operation)
Compatible Devices: NXB-125 series circuit breakers
Mounting Type: DIN rail, TH35-7.5 steel rail
Dimensions (mm):
- Height: 81.6
- Width: 18
- Depth: 75.2
Mounting hole spacing: 45 ± 0.3 / 50.5 ± 0.3
Installation:
- Remove the left cover of the circuit breaker.
- Attach OUVT-X3 as shown in the assembly diagram (Fig. 2).
- Mount the combined unit onto the TH35-7.5 rail
Compliance: RoHS

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OUVT-X3-ACCESSORIES-(FINAL-POWER-DISTRIBUTION)-Catalog.pdf

279.49KB

2025-12-24

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2004-OUVT-X3-Accessories (Final Power Distribution)-Manual.pdf

442.31KB

2024-09-22

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OUVT-X3-Accessories (Final Power Distribution)-Drawing-2D.DWG

102.72KB

2024-12-17

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OUVT-X3-Accessories (Final Power Distribution)-Drawing-3D.STP

4.38MB

2024-12-17

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FAQs

What is the function of the OUVT-X3 Over/Under Voltage Release?

It protects electrical circuits from abnormal voltage fluctuations by tripping the connected circuit breaker when voltage exceeds or drops below safe thresholds.

Which circuit breakers are compatible with the OUVT-X3?

The OUVT-X3 is specifically designed for use with CHINT’s NXB-125 series circuit breakers.

What are the tripping thresholds for over- and under-voltage?

Trips when voltage drops to ≤35% of rated voltage (Ue) or exceeds 95%–105% of the over-voltage setting (280V).

Prevents breaker closing if voltage remains outside the safe operating window.

How is the OUVT-X3 installed?

Simply remove the left cover of the NXB-125 breaker, attach the OUVT-X3 module, and mount both on a TH35-7.5 DIN rail.

What is the expected service life of this device?

The OUVT-X3 ensures 4000 total operating cycles, including 500 for over-voltage trips, 500 for under-voltage trips, and 3000 for regular switching.