Overview
The Sylvania KTM31-12 is a Type TM thermal overload relay designed to protect three-phase motors from overload conditions. Rated for 600VAC maximum, this Size 1, 3-pole unit integrates into magnetic starter assemblies and motor control circuits. It is part of the Bulletin 7324 product line and features dependable thermal protection technology suitable for industrial maintenance and legacy system support.
Key Features
- 3-Pole Configuration — Protects all three phases of AC motor circuits
- 600VAC Rated — Suitable for industrial distribution voltages up to 600V
- Size 1 Frame — Standard NEMA mounting for compatibility with Size 1 contactors and starters
- Type TM Design — Thermal overload technology with manual or automatic reset options
- Auxiliary Contact — 1 Normally Closed contact for alarm or interlock circuits
- Bulletin 7324 — Legacy product line with proven field reliability
Technical Specifications
- Model Number: KTM31-12
- Manufacturer: Sylvania / Joslyn Clark
- Type: TM Thermal Overload Relay
- Voltage Rating: 600VAC Maximum
- Phase Configuration: 3-Pole / 3-Line
- NEMA Size: Size 1
- Auxiliary Contacts: 1 Normally Closed (NC)
- AC Make Rating: 1800 VA
- AC Break Rating: 180 VA
- Bulletin: 7324
- Condition: Used
Typical Applications
- Three-phase squirrel-cage motor protection in industrial plants
- Retrofit and repair of legacy NEMA motor starter assemblies
- OEM motor control center replacement modules
- Maintenance replacement in existing Type TM starter circuits
- Industrial machinery requiring thermal overload cutout
Compatibility & Replacements
Compatible With
- NEMA Size 1 magnetic contactors and starters
- Sylvania / Joslyn Clark Type TM motor control circuits
- Bulletin 7324 motor starter assemblies
- Three-phase AC motor protection schemes up to 600VAC
- Motor Control Centers (MCCs) with Size 1 mounting slots
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The KTM31-12 is discontinued by the manufacturer; confirm that replacement overload units meet your thermal curves and reset requirements before installation.
Works With
- Thermal overload relay reset circuits (manual or automatic)
- Hardwired motor control logic (no programmable controllers required)
- Auxiliary contact interlocks and alarm circuits
- Standard three-phase AC power distribution at 50/60 Hz
