| Product Line | Electrical |
| Category Name | Switches & Flashers |
| Part Type | Relay Switch |
| Alternate Part Name | Dynatard Relay Switch, Continuous Duty Solenoid., Solenoid Switch, Power Relay |
| OEM Part Number | 2MR377 |
| Application Type | Heavy Duty Trucks, Semi-Trucks |
| Terminal Connection Type | Stud |
| Terminals Count | 4 |
| Thread Large Pole Size | 5/16-18 UNF-2A |
| Thread Small Pole Size | #10/32 UNF-2A |
| Material | Metal, Thermoplastic Polymer |
| Current Rating | 100 A |
| Operating Voltage | 12 Volts |
| Net Weight | 0.98 lb. |
| Cross References | 2MR377, MSW-1241, MSW1241, SBC-4201C, SBC4201C |
| Intended Application | - Compatible with Mack CH, RD, DM, and Granite. Primarily used as a demand sensor in the Dynatard application (engine brake).
- Always compare with your OEM part number prior to purchase to confirm full compatibility.
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