SPG-4426-0090 Motor Protection Trip Unit Unit

Module Feature

SPG-4426-0090 is an electronic motor protection trip unit for low voltage motor starter and feeder application.

It continuously monitors three-phase motor current through built-in current transformers, providing overload, phase loss, phase unbalance, locked rotor and short circuit protection. Protection thresholds and delay time are adjustable on the front panel. It offers adjustable trip class, thermal memory function and optional earth fault protection. Suitable for pumps, fans, compressors and conveyors. Widely stocked as maintenance spare for industrial motor control cabinet.

Working principle

Current transformers feed phase current signals to the trip unit.

The electronic circuit calculates thermal load state and compares measured value with protection setpoint. When overload or fault exceeds the configured limit, the unit activates trip relay output to open the contactor and protect the motor. Thermal memory function prevents immediate restart of an overheated motor.

Onboard components

Current transformer module, trip calculation circuit, adjustment knob and DIP switch, trip relay output, status LED, dial setting window and flame retardant housing.

LED indicators

Front LEDs indicate power, overload trip and earth fault alarm status.

Hardware self‑diagnosis

Internal circuit detects CT open circuit and trip relay health. Parameter setting is adjusted locally through front panel knobs and DIP switches.

Programming software

Not applicable, locally adjustable electronic trip unit.

Electrical & Process Parameters

Model:SPG-4426-0090 Brand:OEM motor protection Device type:Motor protection trip unit Function:Overload, phase loss and short circuit protection for low voltage motor feeder

Mechanical & Structure

Mounting:Panel mount inside motor control cabinet Protection class:IP40 (front panel) Housing:Flame retardant reinforced plastic

Environmental

Operating temperature:-20℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:CE Status:Original motor protection spare

Installation

Cut off control power before replacement.

Wire phase current transformer, connect trip output to contactor circuit, set protection parameters on front panel, test overload trip and reset function after commissioning.

Interface

Phase current input terminals, trip relay output terminals, earth fault sensing terminal.

Diagnostic

Overload trip: Motor overloaded, ambient temperature high. Phase loss alarm: One phase current missing, wiring loose. Nuisance trip: Protection setting too low, contactor welding.

Product Brief

SPG-4426-0090 unit, adjustable electronic motor protection trip unit spare for low voltage motor starter cabinet replacement.