21CH38-18 Limit Switch – Honeywell SPDT 4A 28VDC Roller

Product Overview – 21CH38-18

• Type: Limit Switch
• Brand: Honeywell
• Model: 21CH38-18
• Contact Form: SPDT
• Current Rating: 4 A at 28 VDC
• Actuator: Roller
• Mounting: Panel Mount
• Termination: Wire Lead

Technical Data – Tree Structure

• Electrical
  • Contact form: SPDT
  • Current: 4 A
  • Voltage: 28 VDC
  • Non-illuminated
• Mechanical
  • Actuator: Roller
  • Operating force: 6 to 12 lb
  • Mounting: Panel mount
  • Termination: Wire leads
• Physical
  • Weight: 0.737 kg
  • Enclosed switch design

Expert Review

21CH38-18 delivers reliable SPDT switching at 4 A / 28 VDC. The roller actuator suits moving machinery parts. It handles 6-12 lb operating force. A durable choice for industrial position sensing.

Manager’s Insight

This limit switch simplifies installation with wire leads. The enclosed design protects against dust and debris. Use it for conveyor end-stops, door position sensing, or elevator controls.

Compatible Devices & Applications

• Devices: PLCs, relays, motor contactors, control panels
• Applications: Conveyor end-stops, door position sensing, elevator controls
• Industries: Material handling, packaging, elevators, HVAC
• Mounting: Panel mount with roller actuator

Comparison – Similar Models

• 21CH38-14 – 4 A, 125/250 VAC version
• 21CH38-16 – 4 A, 28 VDC with lever actuator
• 21CH38-20 – 4 A, 28 VDC with plunger actuator

FAQ – Professional Questions

• Q: What is the contact configuration?
• A: SPDT (Single Pole Double Throw).
• Q: What is the maximum current rating?
• A: 4 A at 28 VDC.
• Q: What type of actuator does it have?
• A: Roller actuator.
• Q: What is the operating force range?
• A: 6 to 12 lb.
• Q: How does it connect to the circuit?
• A: Wire leads.

Experience-based FAQ & Selection Guide

• Q: Why does my switch not activate?
• A: Check the actuator alignment and operating force.
• Q: Can I use this in wet environments?
• A: It is enclosed but not sealed; avoid direct water splash.
• Q: How to mount this switch?
• A: Use panel mount with two mounting holes.
• Q: What is the expected lifespan?
• A: Mechanical life exceeds 10 million operations.
• Q: Can I use it with 24 V DC?
• A: Yes, it works with 28 VDC systems.
• Q: How to extend the wire leads?
• A: Use splice connectors or terminal blocks.

Selection Guide – What to Consider

• Actuator: Roller for sliding or moving targets.
• Contact: SPDT for simple on/off control.
• Voltage/current: 28 VDC at 4 A suits most control circuits.
• Mounting: Panel mount with wire leads for easy installation.
• Environment: Use in dry indoor locations.

Warranty, Shipping & Support

• Warranty: 12 months against manufacturing defects.
• Dispatch: 12–24 hours after order confirmation.
• Couriers: FedEx, UPS, DHL (express delivery).

Contact Information

For inquiries: sales@powergearx.com
WhatsApp: +86 18030005825

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