| Product Line | Electrical |
| Category Name | Switches & Flashers |
| Part Type | Relay Switch |
| Alternate Part Name | Engine Brake disable Relay, Horn Relay |
| OEM Part Number | 2MD2149M |
| Application Type | Heavy Duty Trucks, Semi-Trucks |
| Terminal Connection Type | Socket |
| Terminals Count | 5 |
| Material | Thermoplastic Polymer |
| Current Rating | 35 A |
| Operating Temperature Range | -40 °C / 125 °C |
| Operating Voltage | 12 Volts |
| Net Weight | 0.08 lb. |
| Cross References | 2MR2149M, 3519350C1, MSW-1237, MSW1237 |
| Intended Application | - Designed to be fully compatible with Mack, Navistar, Freightliner, and Volvo trucks in high-demand electrical systems. Its intended application focuses on the control and protection of critical circuits such as the horn system, engine brake mechanism, lighting management, and auxiliary load protection up to 35A, using an internal resistor to safeguard the vehicle's electronics against voltage spikes.
- Always compare with your OEM part number prior to purchase to confirm full compatibility.
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