Product Introduction

The ABB 1VCF349767S0912 is a specialized electromechanical locking release developed for compatible ABB medium-voltage circuit breaker truck systems. Unlike a conventional circuit breaker trip coil, its primary purpose is associated with the locking and release mechanism of the withdrawable truck.

In medium-voltage switchgear, the circuit breaker truck must move between defined mechanical positions while maintaining the required electrical and mechanical interlocks. A properly functioning locking release helps prevent inappropriate movement or operation and allows the truck mechanism to respond correctly to the designated control conditions.

The 1VCF349767S0912 belongs to the RLE2 locking release family and is specified for a 125–132 V DC / 125 V AC auxiliary supply. It is associated with compatible YL2-RL2-RLE2 truck mechanisms used across several ABB circuit breaker families.

For replacement applications, the exact truck configuration is particularly important. Similar-looking locking releases can have different auxiliary voltage ratings or mechanical applications, so the complete ABB ordering code should be matched before installation.

Technical Specifications

Specification	Details
Brand	ABB
Model	1VCF349767S0912
Product Type	Electromechanical Locking Release
Component Type	Locking Coil / RLE2
Truck Configuration	YL2-RL2-RLE2
Auxiliary Voltage	125–132 V DC / 125 V AC
Application	Circuit Breaker Truck
Associated Breaker Families	VD4 / Vmax / VSC / VM1 / HD4
Maximum Applicable Voltage Class	Up to 36 kV, depending on configuration
Dimensions	160 × 95 × 140 mm
Weight	0.40 kg / 0.88 lb
Installation	Circuit Breaker Truck Mechanism
Primary Function	Electromechanical Locking and Release

The auxiliary-voltage specification is a key selection parameter. The replacement component should match both the electrical control circuit and the mechanical truck configuration.

Recommended Related Models

Model	Description
ABB 1VCF349767S0909	Electromechanical Locking Release, 110 V DC
ABB 1VCF349767S0918	Electromechanical Locking Release, 220 V DC
ABB 1VCF349767S0932	Electromechanical Locking Release, 24–30 V AC
ABB 1VCF349767S0934	Electromechanical Locking Release, 48 V AC
ABB 1VCF349767S0941	Electromechanical Locking Release, 125 V AC
ABB 1VCF349767S0950	Electromechanical Locking Release, 230–240 V AC

Popular Related Models

Model	Product Description
ABB 1VCR004290G0005	Under Voltage Release, 110–132 V DC / 110–127 V AC
ABB 1VCR004289G0005	Opening Release, 110–132 V DC / 110–127 V AC
ABB 1VCR004291G0005	Shunt Closing Release, 110–132 V DC / 110–127 V AC
ABB 1VCR012079G0003	Circuit Breaker Geared Motor
ABB 1VCR012079G0004	Circuit Breaker Geared Motor
ABB 1VCR012079G0005	Circuit Breaker Geared Motor

The ABB 1VCF349767S0912 is a dedicated locking-release component rather than a general-purpose relay or trip coil. For reliable replacement, match the complete part number, auxiliary voltage, YL2-RL2-RLE2 truck configuration, and compatible circuit breaker model before installation.

Applications in Medium-Voltage Switchgear

The ABB 1VCF349767S0912 is used in circuit breaker truck mechanisms where controlled electromechanical locking and release are required.

Typical applications include:

ABB VD4 vacuum circuit breakers
ABB Vmax vacuum circuit breakers
ABB VSC circuit breakers
ABB VM1 vacuum circuit breakers
ABB HD4 circuit breakers
YL2-RL2-RLE2 truck mechanisms
Medium-voltage switchgear
Withdrawable circuit breaker systems
Electrical distribution equipment
Substation switchgear
Industrial power distribution
Circuit breaker maintenance and replacement

The component is especially useful in withdrawable switchgear, where mechanical positioning and electrical interlocking are important for safe and controlled circuit breaker operation.

Key Benefits and Functional Features

Dedicated Truck Locking Function
The 1VCF349767S0912 is designed specifically as an electromechanical locking release for compatible YL2-RL2-RLE2 circuit breaker truck mechanisms.

125–132 V DC / 125 V AC Auxiliary Supply
The model is designed for installations using the specified 125–132 V DC or 125 V AC auxiliary control supply.

Broad ABB Breaker Compatibility
Compatible configurations include selected VD4, Vmax, VSC, VM1, and HD4 circuit breaker families, with application depending on the specific truck and breaker configuration.

Supports Switchgear Interlocking
The locking mechanism helps coordinate the mechanical position of the circuit breaker truck with the electrical control system, supporting controlled operation of withdrawable equipment.

Compact Mechanical Assembly
Its 160 × 95 × 140 mm dimensions allow the locking release to be integrated into the corresponding truck mechanism without requiring a separate external assembly.

Suitable for Replacement and Service
The component is well suited to maintenance programs where an existing locking coil or electromechanical release requires replacement because of electrical failure, mechanical wear, or abnormal operation.

Technical FAQs

1. What is the ABB 1VCF349767S0912 used for?
It is an electromechanical locking release for compatible ABB circuit breaker truck mechanisms. It provides electrically controlled locking and release functionality within the truck assembly.

2. What truck mechanism is associated with this model?
The 1VCF349767S0912 is specified for the YL2-RL2-RLE2 truck configuration.

3. What is the auxiliary voltage rating?
The specified auxiliary supply is 125–132 V DC / 125 V AC.

4. Which ABB circuit breaker families can use the 1VCF349767S0912?
Compatible configurations include selected VD4, Vmax, VSC, VM1, and HD4 circuit breaker families, depending on the truck and switchgear configuration.

5. What is the purpose of an electromechanical locking release in a withdrawable breaker?
It provides controlled mechanical locking or release of the truck mechanism in response to the associated electrical control circuit, helping coordinate mechanical positioning and electrical interlocking.

6. What symptoms may indicate a defective locking release?
Possible symptoms include failure to release when the correct control voltage is applied, inability to establish the required truck position, abnormal locking behavior, intermittent operation, or failure of the associated interlocking sequence.

7. Can a 110 V DC version replace the 1VCF349767S0912?
Not automatically. The 1VCF349767S0912 is specifically designed for 125–132 V DC / 125 V AC applications. A different voltage version should only be used when the circuit breaker and control circuit are specifically designed for it.

8. What should be inspected before replacing the locking release?
Technicians should check the complete part number, truck type, circuit breaker model, auxiliary voltage, wiring, connectors, mechanical linkage, and interlocking mechanism before installing a replacement.

9. Does the locking release work independently of the truck mechanism?
No. It forms part of the truck's mechanical and electrical interlocking system. Its correct operation depends on the associated mechanical components and control circuit.

10. What safety measures are required during replacement?
The circuit breaker and truck must be placed in the appropriate maintenance condition, electrical supplies must be isolated according to site procedures, and stored mechanical energy must be controlled before work is performed. Only qualified personnel should service medium-voltage switchgear.

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