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| PartNumber | 21EN51-R3 | 21EN51-6B | 21EN51-6 |
| Description | Basic / Snap Action Switches Enclosed SW DPDT 4 A Top Roller PLGR SCRW | Basic / Snap Action Switches N.O./N.C. SPDT 4A Enclosed Switch | Basic / Snap Action Switches Sealed SE/EN SWITCHES |
| Manufacturer | Honeywell | Honeywell | Honeywell Sensing and Productivity Solutions |
| Product Category | Basic / Snap Action Switches | Basic / Snap Action Switches | Snap Action, Limit 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 | - |
| Illuminated | Non-Illuminated | Non-Illuminated | - |
| Lamp Type | - | - | - |
| Mounting Style | Chassis Mount | Chassis Mount | - |
| Actuator Style | Roller Plunger | - | - |
| Product Type | Snap Action Switches | Snap Action Switches | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Switches | Switches | - |
| Unit Weight | - | 8.889038 oz | - |
| Series | - | - | * |
| Packaging | - | - | - |
| Mounting Type | - | - | - |
| Features | - | - | - |
| Ingress Protection | - | - | - |
| Circuit | - | - | - |
| Voltage Rating AC | - | - | - |
| Actuator Type | - | - | - |
| Operating Force Torque | - | - | - |
| Release Force | - | - | - |
| Pretravel | - | - | - |
| Differential Travel | - | - | - |
| Overtravel | - | - | - |