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| PartNumber | 21EN51-R3 | 21EN51-R4 | 21EN51-RB8 |
| Description | Basic / Snap Action Switches Enclosed SW DPDT 4 A Top Roller PLGR SCRW | Basic / Snap Action Switches SEALED SE | Basic / Snap Action Switches N.O./N.C. SPDT 4A Enclosed Switch |
| Manufacturer | Honeywell | Honeywell | Honeywell |
| Product Category | Basic / Snap Action Switches | Basic / Snap Action Switches | Basic / Snap Action Switches |
| RoHS | N | - | N |
| Contact Form | DPDT | - | SPDT |
| Switch Function | OFF - (ON) | - | ON - (OFF), OFF - (ON) |
| Actuator | Roller Plunger | - | - |
| Current Rating | 4 A | - | - |
| Voltage Rating DC | 28 VDC | - | - |
| Operating Force | 0.1 N | - | - |
| Termination Style | Screw | - | Screw |
| Illumination Color | - | - | - |
| Brand | Honeywell | Honeywell | Honeywell |
| Illuminated | Non-Illuminated | Non-Illuminated | Non-Illuminated |
| Lamp Type | - | - | - |
| Mounting Style | Chassis Mount | Chassis Mount | Chassis Mount |
| Actuator Style | Roller Plunger | - | - |
| Product Type | Snap Action Switches | Snap Action Switches | Snap Action Switches |
| Factory Pack Quantity | 1 | 1 | 1 |
| Subcategory | Switches | Switches | Switches |