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21CX4
The Honeywell 21CX4 is an explosion-proof limit switch designed for demanding environments. This switch has a versatile voltage rating of 120/240/480 VAC or 125/250 VDC and can handle a maximum current of 15 Amps in AC applications and 0.5 Amps in DC scenarios. Features also include a robust IP66 rating for dust and water resistance, and an operational temperature range from -25°C to 85°C.
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Technical specifications for 21CX4
| Manufacturer | Honeywell |
|---|---|
| Product Type | Explosion-proof limit switch |
| Product Line | Micro Switch |
| Part Number | 21CX4 |
| Voltage Rating | 120/240/480 VAC or 125/250 VDC |
| Current Rating | 15 Amps (AC), 0.5 Amps (DC) |
| IP Rating | IP66 |
| Operating Temperature Range | -25°C to 85°C |
| Housing Material | Aluminum with electrostatic epoxy coating (standard housing) |
| Actuator Type | Side rotary type (lever not included) |
| Contact Configuration | 4x SPDT, 1NC/1NO each with momentary action and silver contacts |
| Conduit/Termination | 3/4-14 NPT conduit with screw terminals |
| Sealing (NEMA Rating) | NEMA 1, 3, 4, 4X, 6, 6P, and 13; NEMA 7 (Class I, Groups C and D) and 9 (Class II, Groups E,F, and G) |
| Operating Torque | 1.25 N·m [11.1 in-lb] max. |
| Travel Characteristics | 15° pretravel max., 10° differential travel max., and 90° overtravel min. |
The 21CX4 model from Honeywell serves as a reliable explosion-proof limit switch suitable for harsh operating conditions. Weighing 3.00 lbs, this unit operates effectively at voltage levels of 120/240/480 VAC or 125/250 VDC. When dealing with alternating current, it supports a maximum current load of 15 Amps, while in direct current applications, the limit is set at 0.5 Amps. This model meets an IP66 rating, ensuring protection against dust and water ingress.
The operational capabilities of this limit switch span a temperature range from -25°C to 85°C, making it versatile across various applications. The housing is constructed from aluminum, treated with an electrostatic epoxy finish for enhanced protection. The side rotary type actuator is used, but it is essential to note that the lever is not included with the switch.
The contact configuration features four SPDT contacts, configured with two types — one normally closed (1NC) and one normally open (1NO) — each with momentary action. The device allows for 3/4-14 NPT conduit connections with conveniently located screw terminals for easy installation. The device offers comprehensive sealing capabilities with NEMA ratings of 1, 3, 4, 4X, 6, 6P, and 13, as well as explosion-proof classifications NEMA 7 for Class I, Groups C and D and NEMA 9 for Class II, Groups E, F, and G.
The maximum operating torque for the switch is rated at 1.25 N·m (11.1 in-lb). It provides precise travel characteristics, with a maximum pretravel of 15°, a maximum differential travel of 10°, and a minimum overtravel of 90°. Overall, the Honeywell 21CX4 is engineered to deliver dependable performance in demanding and potentially hazardous environments.
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