ABB SPUV120AC Voltage Relief Module

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1. Product Overview

The ABB SPUV120AC Voltage Relief Module (Undervoltage Release) is an accessory installed on circuit breakers. When the control voltage drops below the preset threshold, the module automatically trips the breaker to protect equipment from operating under unsafe low-voltage conditions. Once the voltage returns to an acceptable level, the module resets and allows the breaker to be closed again. It is widely used in distribution systems requiring voltage monitoring and safety interlocking.

2. Technical Specifications

• Model: SPUV120AC

• Type: Undervoltage Release Module (UVR)

• Rated Control Voltage: 120 VAC

• Trip Voltage Range: Approximately 35%–60% of rated voltage

• Reset (Sealing) Voltage: Approximately 60%–85% of rated voltage

• Peak Inrush Current: ~3 A (2–6 ms duration)

• Nominal Operating Current: ~80 mA RMS

• Frequency: 50/60 Hz

• Additional Function: Provides +24V DC power to compatible trip units when energized

• Compatibility: Works with MicroVersaTrip Plus / PM trip units

• Installation: Field-installable accessory

3. Advantages & Features

• Reliable undervoltage protection: Trips the breaker during voltage drops to prevent equipment damage.

• Automatic reset: Allows the breaker to be re-closed once voltage returns to safe levels.

• Enhanced operational safety: Prevents closing under insufficient voltage conditions.

• Event recording capability: When paired with compatible trip units, undervoltage trip events can be logged.

• Easy integration and retrofit: Can be added to existing breakers without replacing the main device.

• Wide applicability: Suited for standard 120 VAC control systems and 50/60 Hz environments.

4. Typical Applications

• Industrial distribution panels and motor control centers

• Factory automation lines and machine electrical systems

• Commercial and building power distribution

• Data centers and critical power environments

• Utility, infrastructure, and power distribution stations

• Installations requiring undervoltage interlock and system protection

5. Cautions & Notes

• Ensure the control voltage is 120 VAC for proper operation.

• Account for the initial inrush current (~3 A) in protection circuit design.

• Installation and wiring should be performed by qualified personnel.

• The module controls undervoltage release only; the breaker handles the actual interruption.

• Verify compatibility if event-logging functions are required.

• Conduct functional testing after installation to ensure proper trip and reset behavior.

The structure and details of the product：

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