1. Product Description

The CHINT UVR / UVT 220V AC Undervoltage Release is a circuit-breaker accessory designed to initiate circuit-breaker opening when its control supply voltage falls below the specified operating level.

It is used in electrical distribution systems and industrial control panels where disconnection during an undervoltage condition is required. Depending on the accessory design, it may also prevent the circuit breaker from closing when the required control voltage is unavailable.

This accessory helps support electrical system safety and controlled operation by providing an undervoltage release function in compatible circuit breakers.

VITS Pakistan supplies CHINT electrical accessories for industrial, commercial and electrical panel applications.

2. Short Description

3. Key Features

• Undervoltage release function for compatible circuit breakers.

• Designed for use with a specified 220V AC control supply.

• Initiates breaker release when voltage falls below the specified threshold.

• Can help prevent operation under an inadequate control-supply condition.

• Suitable for electrical distribution and industrial control applications.

• Compact accessory arrangement for compatible circuit breakers.

• Supports electrical interlocking and control-panel designs where specified.

4. Working Principle

An undervoltage release monitors the voltage supplied to its operating coil.

1. Normal voltage: The accessory receives its required control voltage, allowing the compatible circuit breaker to remain closed or be closed, depending on its design.

2. Voltage drop: If the supply falls below the manufacturer’s specified operating threshold, the release mechanism operates.

3. Circuit interruption: The associated circuit breaker opens through its mechanical release mechanism.

4. Voltage restoration: After the control supply returns to the required level, the breaker may be reset or reclosed according to the manufacturer’s operating requirements.

Important: The undervoltage release is an accessory for a compatible circuit breaker. It does not independently interrupt the main circuit.

5. Manufacturer-Documented Technical Specifications

CHINT’s published UVT-X1 catalogue identifies the accessory as an Undervoltage Release, compatible with NXB-63 and NXB-40 circuit breakers. The catalogue specifies 240V AC, while your VITS price list identifies the item as 220V AC. Confirm the actual unit’s nameplate before publishing the voltage as a final specification.

Voltage clarification: If the supplied unit is marked 220V AC, list it as 220V AC only after checking the product label and corresponding CHINT documentation. Do not automatically substitute 240V catalogue data for a different voltage variant.

6. Undervoltage Operating Characteristics

The CHINT UVT-X1 catalogue describes the following operating behaviour:

For the catalogue’s 240V AC version, the approximate thresholds are:

• 35% = 84V

• 70% = 168V

• 85% = 204V

• 110% = 264V

These are calculated values based on the 240V catalogue rating, not independently verified settings for the 220V unit.

7. Applications

The CHINT undervoltage release can be used in:

• Industrial electrical distribution boards.

• Commercial electrical panels.

• Machinery control panels.

• Motor control and automation panels.

• Electrical distribution systems requiring undervoltage disconnection.

• Control circuits where breaker closing must be inhibited during inadequate supply voltage.

• Industrial equipment protection arrangements.

8. Main Benefits

• Undervoltage disconnection: Opens the associated breaker when voltage enters the specified operating range.

• Closing interlock: Helps prevent breaker closing when voltage is below the manufacturer’s permitted level.

• Equipment protection: Supports system designs that disconnect loads during inadequate supply voltage.

• Automatic release operation: Works through the compatible breaker’s mechanical release mechanism.

• Compact accessory: Designed to attach to compatible CHINT circuit breakers.

• Industrial application: Suitable for distribution and control-panel assemblies.

9. Compatibility and Selection

CHINT documentation identifies the UVT-X1 as compatible with:

• CHINT NXB-63 series.

• CHINT NXB-40 series.

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The CHINT NXB-63H product information also lists UVT-X1 among its compatible accessories.

Before ordering, confirm:

1. Circuit breaker series and exact model.

2. Accessory model UVT-X1 or other applicable reference.

3. Rated control voltage on the accessory label.

4. Mechanical mounting arrangement.

5. Manufacturer wiring diagram and terminal connections.

Do not assume UVT-X1 compatibility with every CHINT MCB series.

10. Installation Guidelines

1. Switch off and isolate the electrical supply.

2. Apply lockout/tagout procedures and verify absence of voltage.

3. Confirm the circuit breaker is a compatible CHINT model.

4. Remove the designated side cover as instructed in the CHINT manual.

5. Fit the UVT-X1 in the designated accessory position.

6. Assemble the breaker and accessory on a TH35-7.5 mounting rail.

7. Connect the control supply according to the manufacturer’s wiring diagram.

8. Verify the control voltage and frequency against the accessory nameplate.

9. Test undervoltage release operation and breaker closing behaviour under controlled conditions.

Safety: Installation and commissioning must be performed by a qualified electrician. Never install or remove the accessory while energised.

11. Important Engineering Notes

• UVT is an undervoltage release accessory; it is not a standalone circuit breaker.

• It operates through the mechanical release mechanism of a compatible breaker.

• It does not replace overload or short-circuit protection.

• The accessory must receive the correct control voltage.

• Do not connect 220V AC or 240V AC without checking the accessory’s rated voltage.

• The operating threshold is model-dependent.

• Use the manufacturer’s wiring diagram for installation and testing.

• Confirm whether the product supplied by VITS is UVT-X1 or another CHINT undervoltage accessory.

12. Difference Between UVR, UVT and SHT

Selection advice: Choose UVT when the requirement is undervoltage disconnection. Choose SHT when an external electrical signal is required to trip the breaker.

13. Frequently Asked Questions

Q1. What is a CHINT UVT?

It is an undervoltage release accessory that operates a compatible circuit breaker when its control voltage falls below the specified operating range.

Q2. What is the difference between UVR and UVT?

Both terms refer to undervoltage release functionality. The exact CHINT model reference should be used when ordering.

Q3. Is this product suitable for 220V AC?

Your VITS price list identifies the item as 220V AC. However, the published CHINT UVT-X1 catalogue specifies 240V AC. Check the exact product marking and documentation before connecting it.

Q4. Can UVT-X1 be used with CHINT NXB-63H?

CHINT lists UVT-X1 among the compatible accessories for NXB-63H. Confirm the exact breaker variant and accessory revision.

Q5. What happens when voltage drops?

The accessory operates within its specified undervoltage range and trips the associated circuit breaker.

Q6. Does UVT provide short-circuit protection?

No. Short-circuit and overload protection are provided by the circuit breaker itself.

Q7. Can it be used with industrial control panels?

Yes, provided the circuit breaker, control voltage and installation arrangement are compatible.

Q8. What is the price at VITS Pakistan?

The VITS listed price is PKR 1,400, subject to stock and price confirmation.

14. Price and Ordering Information

15. Why Buy from VITS Pakistan?

VITS provides CHINT electrical products and accessories for industrial and commercial applications.

• CHINT electrical product sourcing.

• Industrial switchgear and control-panel solutions.

• Circuit-breaker accessory selection.

• Technical assistance for electrical applications.

• Product supply for industrial and commercial projects.

• Quotation and procurement support.

VITS focuses on CHINT Global Version products. Product-specific compliance documentation should be checked for the supplied model and batch.

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