Pull Cord Switch For Conveyor SN4170-SL-C

Product Overview
A conveyor run is long, and the operator who walks it is rarely standing at the control cabinet. On this pull cord switch, the rope spans the length of the run, so a pull from any point along it shuts the drive down. Let the rope go and the contacts return to their normal position by themselves, so staff do not need to walk the full conveyor run again just to clear the unit. A jam, a stray package on the belt: on a pull cord switch with automatic reset, these stay a brief stop. For maintenance or cleaning work, please use the manual-reset variant.

Key Specifications
- Contact Function: The NC contact holds the control circuit closed in normal operation. Pulling the rope opens it and stops the line. The NO contact closes at the same time for a signal or indicator.
- Terminal Markings: 13-14 (NO), 21-22 (NC)
- Enclosure Type: Type 1
- Ingress Protection: IP65 (higher grades available on request)
- Standards: EN50041, EN60947-5-1
- Operating Force: 1.5 kgf (14.71 N) at the metal pull ring
- Enclosure Base: Zinc alloy
- Housing: Industrial-grade flame-retardant shell
- Contacts: Silver contacts

Applications
Warehouse conveying is where this model is at home. A conveyor pull cord switch is mounted so the rope stays within reach at every station along the way. That reach covers the points where a warehouse stops a belt: the loading point, the transfer point where one conveyor hands off to the next, the packing benches beside a discharge conveyor. Where an operator works at the belt instead of at a panel, a pull cord switch puts the stop where the person already is. Industrial production lines and elevators are the other two places this conveyor pull cord switch turns up.

About Us
Founded in 2001, CHNANMA produces pull cord switches at a 6,000-square-meter factory in Ruijin City, Jiangxi Province, and our business office is in Wenzhou, Zhejiang. Production runs under ISO 9001:2015 quality management, with ISO 14001 environmental management and ISO 45001 occupational health and safety in place, and our products carry CE, CCC, CB, CQ and RoHS certifications. Engineering staff account for about 30% of the workforce, and OEM/ODM customization is supported. Send us your conveyor details and we will recommend the right pull cord switch for the run.

FAQ
Q: Does anything have to be cleared at the unit during a walk-round?

A: No. Releasing the rope returns the contacts to their normal position, so nothing is left to clear at the pull cord switch. Whether the drive then starts is the control circuit's decision.

Q: Can it replace the switch already fitted to an old conveyor run?

A: If the unit on the run works on a 1 NO + 1 NC scheme, the terminals on this conveyor pull cord switch match it: NC on 21-22, NO on 13-14. Send us the old scheme and we will confirm.

Q: Will dust and damp get into the mechanism?

A: The enclosure is rated IP65, which covers dust ingress and water jets. Where a line runs wetter, higher protection grades are available on request. Send us the environment and we will advise on the pull cord switch build.