Horton 993619 Thermal Switch | 185 Degrees F | Normally Closed (N.C.) | 1/2 NPT Thread | Replaces International 1685131C92 & Kit Masters 3619 | for Air-to-Release Fan Clutches
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Product details
| Management number | 215490157 | Release Date | 2026/04/12 | List Price | US$49.98 | Model Number | 215490157 | ||
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Horton 993619 Engine Fan Thermal Switch - 185°F (N.C.) The Horton 993619 is a specialized mechanical thermal switch for heavy-duty cooling systems. Unlike standard switches that turn "On" when hot, this unit is Normally Closed (N.C.). It is designed to break the electrical circuit when the engine coolant reaches 185°F, which is the signal required for many fail-safe (spring-engaged) fan clutches to activate. Technical SpecificationsPart Number: 993619Switch Type: Mechanical Thermal SwitchNormal Position: Normally Closed (N.C.)Set Point (Action): Opens at 185°F (85°C)Reset Point: Closes at 178°F (81°C)Thread Size: 1/2" NPTCountry of Origin: United StatesCross-Reference Compatibility This switch is manufactured to replace the following part numbers: Replaces International / Navistar: 1685131C92Replaces Cummins: 3947397Replaces Kit Masters: 3619, KC3619Replaces Index: 8037016, 8037016PReplaces Medallion: 1002-07393-29Replaces Horton: 993602, 983651Important Tech Note Please verify your existing switch is Normally Closed. If you need the Normally Open version (closes at 205°F) for a standard On/Off fan, you likely need part number 993655 instead.
- GENUINE REPLACEMENT: Authentic Horton 993619 Thermal Switch. Designed for "Fail-Safe" engine cooling systems where the electrical circuit must remain closed to keep the fan disengaged (off) during normal operation.
- REPLACEMENT PART: Direct replacement for International / Navistar 1685131C92. Replaces Cummins 3947397. Replaces Kit Masters 3619. Replaces Index 8037016 and 8037016P. Replaces older Horton 993602 and 983651.
- VERIFIED SPECS: Activation Temp: 185°F (85°C) | Reset Temp: 178°F (81°C) | Circuit: Normally Closed (N.C.) | Thread Size: 1/2" - 14 NPTF | Terminals: 2 Screw Type.
- OPERATING LOGIC: This is a "Normally Closed" switch. It sends electrical current (Closed) when the engine is cool. When coolant reaches 185°F, the switch OPENS (cuts power), triggering the fan clutch to engage.
- VERIFIED APPLICATIONS: Compatible with International and Cummins engines using Kysor K-22 or similar "Air-to-Release" rear-air fan clutches that require a power-to-disengage signal.
| Model | 993619 |
|---|---|
| Brand Name | Horton |
| Unit Count | 1.0 Count |
| Manufacturer | Horton |
| Material Type | Alloy Steel |
| Connector Type | Clamp |
| Current Rating | 0.01 Amps |
| Operation Mode | ON-OFF |
| Item Dimensions | 2 x 2 x 2 inches |
| Number of Items | 1 |
| Included Components | Thermal Switch |
| Number of Positions | 2 |
| Lower Temperature Rating | 178 Degrees Fahrenheit |
| Upper Temperature Rating | 185 Degrees Fahrenheit |
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