Mitsubishi TH-N12KP Thermal Overload Relay | Replacement, Equivalent & Selection Guide
The Mitsubishi TH-N12KP is a thermal overload relay from Mitsubishi Electric’s TH-N series, designed for motor protection in industrial automation and control panel applications. This page provides full technical specifications, compatible replacement models, selection guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
| Manufacturer | Mitsubishi Electric |
| Model / SKU | TH-N12KP |
| Series | TH-N |
| Type | Thermal Overload Relay |
| Rated Current Range | Approx. 7–12 A (adjustable) |
| Mounting | Direct mount to S-N series contactors or panel mount |
| Reset Method | Manual / Automatic selectable |
| Trip Class | Class 10 |
| Auxiliary Contacts | 1 NO + 1 NC |
| Ambient Temperature | -10°C to +60°C |
| Standards | IEC 60947-4-1, JIS C 8201-4-1 |
| Weight | Approx. 300 g |
Compatible Replacement & Equivalent Models
The following models are commonly referenced as functional equivalents or direct replacements for the TH-N12KP. Always verify current ratings and mounting compatibility before substitution.
| Brand | Model | Current Range | Notes |
|---|---|---|---|
| Mitsubishi Electric | TH-N12KP (OEM) | 7–12 A | Original model |
| Mitsubishi Electric | TH-T18KP | 9–13 A | Upgraded TH-T series, check contactor fit |
| Fuji Electric | TR-N3/3 (12A) | 8–12 A | Functional equivalent, verify terminal layout |
| Schneider Electric | LRD16 / LRD21 | 9–13 A / 12–18 A | TeSys D series; adapter may be required |
| Siemens | 3RU2116-1KB0 | 9–12.5 A | 3RU2 series; check contactor compatibility |
| ABB | TA25DU-11 | 7.5–11 A | TA-D series; verify mounting |
Why Choose the Original Model
- Guaranteed compatibility with Mitsubishi S-N series contactors (S-N10, S-N12, S-N18, etc.) for direct-mount configurations.
- Precise trip characteristics calibrated to Mitsubishi’s motor protection standards, reducing nuisance trips.
- Proven reliability in demanding industrial environments with IEC-certified performance.
- Simplified maintenance — identical replacement reduces re-wiring and re-commissioning time.
- Full technical support backed by Mitsubishi Electric’s global service network.
Typical Applications
- Three-phase AC motor overload protection (pumps, fans, compressors, conveyors)
- Motor control centers (MCC) and distribution panels
- Machine tool and CNC equipment control circuits
- HVAC and building automation systems
- Food & beverage, water treatment, and process industries
System Compatibility
The TH-N12KP is designed for direct mounting on the following Mitsubishi Electric contactors:
- S-N10, S-N12, S-N18 (direct mount)
- S-N25, S-N35 (with adapter bracket)
- Compatible with Mitsubishi MSO-N series motor starters
For panel-mount or DIN-rail installation, use the optional mounting adapter (part: TH-N mounting base).
Selection Guide
Use the following criteria to select the correct thermal overload relay for your application:
- Step 1 — Motor FLA: Identify the full-load amperage (FLA) from the motor nameplate. Select a relay whose adjustable range covers the motor FLA.
- Step 2 — Contactor compatibility: Confirm the relay mounts directly to your contactor model. TH-N12KP fits S-N10/12/18 directly.
- Step 3 — Trip class: Class 10 suits standard induction motors. For high-inertia loads, consider Class 20.
- Step 4 — Reset method: Choose manual reset for critical machinery (prevents automatic restart after trip); auto reset for non-critical loads.
- Step 5 — Environment: Confirm ambient temperature range and IP rating requirements for your enclosure.
Need help selecting the right model? Contact our technical team at support@konmask.com.
Quality Assurance & Sourcing
- All products sourced from authorized distributors and verified supply chains.
- Each unit undergoes incoming inspection including visual check, label verification, and functional test where applicable.
- Traceability documentation (COC, packing list, invoice) available upon request.
- We do not supply counterfeit, refurbished, or grey-market components.
How to Order
- Add the TH-N12KP to your cart and proceed to checkout, or
- Contact us for bulk pricing, lead time confirmation, or custom sourcing:
Email: support@konmask.com
Phone/WhatsApp: +0086 19859288691 - Provide your required quantity, delivery address, and any certification requirements.
- We will confirm availability, pricing, and estimated delivery within 1 business day.
Replacement & Compatibility FAQ
Q: Can I replace TH-N12KP with TH-T18KP directly?
A: The TH-T series is an upgraded line. Physical mounting dimensions differ slightly — verify contactor model and terminal positions before substitution.
Q: Is TH-N12KP compatible with S-N25 contactors?
A: Direct mounting is not supported. An adapter bracket is required for S-N25 and larger contactors.
Q: What is the current adjustment range of TH-N12KP?
A: The relay is adjustable approximately 7–12 A. Set the dial to match your motor’s nameplate FLA.
Q: Can I use a Schneider LRD series relay as a replacement?
A: Schneider LRD relays are functionally similar but require a separate mounting adapter and may not fit Mitsubishi contactors without modification.
Q: Do you provide a certificate of conformance (COC)?
A: Yes. COC and traceability documents are available upon request for all orders.
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