Overview
The General Electric RT1T overload relay is a compact thermal protection device designed for three-phase motors in industrial and commercial applications. With a current range of 17.5-22A and Class 10 tripping characteristic, it delivers fast protection against motor overloads while maintaining compatibility with GE CL series IEC contactors. This relay offers both automatic and manual reset modes, making it suitable for systems requiring either hands-off or attended intervention.
Key Features
- Class 10 Tripping: Trips in 10 seconds or less at 1.25× rated current
- Phase Loss Detection: Automatically trips if any phase is lost, preventing motor damage
- Dual Reset Modes: Selectable automatic or manual reset for flexible operation
- Contactor Mount: Direct-mount design to GE CL00-CL45 series 3-pole IEC contactors
- Auxiliary Contacts: 1 NO and 1 NC base-mounted auxiliary contact for signaling and interlock circuits
- Ambient Compensation: Adjustable for varying operating temperatures
Technical Specifications
- Current Range: 17.5–22 A (adjustable)
- Trip Class: Class 10A
- Poles: 3
- Contact Rating: 690 VAC
- Auxiliary Contacts: 1NO–1NC (690 VAC, 22 A)
- Terminal Type: Screw terminals
- Mounting: Contactor base mount (bolt-on to CL series contactors)
- Heating Element: Bimetallic fixed heater + adjustable trip heater
- Operating Temperature Range: –25 to +60 °C
- Dimensions: 1.35 in W × 3.64 in D × 2.52 in H
- Weight: 0.45 lbs
- Frequency: 0–400 Hz
- Approvals: UL, CSA C22.2 (US/Canada), CE
Typical Applications
- Three-phase AC motor overload protection in HVAC systems
- Pump and fan motor starters with IEC contactors
- Compressor motor protection in refrigeration and air conditioning
- Machine tool drive motor overload circuits
- Industrial automation conveyor and material handling equipment
- Process control systems requiring thermal motor protection
Compatibility & Replacements
Compatible With
- GE CL02A310T 3-pole IEC contactor
- GE CL04A310M 3-pole IEC contactor
- GE CL45A300M 3-pole IEC contactor
- GE CL00, CL02, CL04, CL25, CL45 contactor series
- IEC standard 3-pole contactor bases with RT-series mount pattern
- Motor starters with 17.5–22 A rated phase current
Replaces / Drop-In Replacement For
- GE RT1T (OEM equivalent and rebuild units)
Works With
- Three-phase AC power systems (50/60 Hz, 0–400 Hz capable)
- Thermal overload protection circuits in motor control centers
- Remote DIN rail mounting via optional RTXP bracket for distributed control
- Manual and automatic motor starter logic chains
