Description

Introduction to Elevator Limit Switch IF17B-05-NO
Manufactured by NANJING ZHUYE ELEVATOR PARTS

The IF17B-05-NO is a precision-engineered electromechanical limit switch designed to provide reliable position feedback for elevator cars, doors, and counterweights. Manufactured by NANJING ZHUYE ELEVATOR PARTS, a leading supplier of high-quality elevator components, this switch is built to meet the stringent safety and performance requirements of EN 81-20/50, ASME A17.1, and GB 7588. It is CE, UL, and CCC certified, ensuring global compliance and dependable operation in both new installations and modernization projects.

1. Technical Specifications
• Switch Type: Snap-action, positive-opening, normally open (NO) contact
• Rated Voltage: 250 V AC / 110 V DC
• Rated Current: 10 A resistive, 6 A inductive
• Contact Material: Silver-nickel alloy with gold flash for low contact resistance (< 30 mΩ)
• Mechanical Life: ≥ 1 million operations
• Operating Force: ≤ 5 N for easy actuation
• Stroke: 17 mm (pre-travel 2 mm, over-travel 4 mm)
• Protection Class: IP67 (dust-tight, protected against immersion)
• Operating Temperature: –25 °C to +85 °C
• Cable: 3 m PVC 22 AWG, 3-core, colour-coded

2. Advanced Features
• Positive-opening mechanism ensures the contact is forcibly opened even if welding occurs, providing fail-safe operation.
• Dual-spring snap-action mechanism for rapid switching and minimal bounce.
• NEMA 4X-rated housing resists corrosion, oil, and wash-down environments.
• LED status indicator (optional) provides visual confirmation of switch state.
• Vibration-resistant design withstands 10 g RMS for 2 hours without false triggering.

3. Safety & Compliance
NANJING ZHUYE ELEVATOR PARTS integrates redundant safety features:
• UL94 V-0 flame-retardant housing
• 1 000 V insulation resistance
• Shock resistance: 30 g for 11 ms
• Certified for SIL 2 / PL c safety functions

4. Installation & Compatibility
• Universal 30 mm × 60 mm mounting pattern fits all major elevator controllers.
• Pre-wired flying leads and colour-coded terminals reduce installation time to under 2 minutes.
• Compatible with OTIS, KONE, Schindler, Thyssen, and Mitsubishi systems.
• Optional stainless-steel roller lever or plunger actuators for different mounting orientations.

5. Applications
• Car top and pit limit switches for over-travel protection
• Door position sensing for full-open / full-close confirmation
• Counterweight buffer engagement detection
• Hoistway access point interlocks

6. Durability & Environmental Resistance
The switch is salt-spray tested for 500 h (ASTM B117) and UV-stabilised for outdoor hoistway use. The contact block is sealed against dust and moisture, ensuring reliable operation in harsh elevator environments.

7. After-Sales Support
NANJING ZHUYE ELEVATOR PARTS provides a 3-year warranty, 24-hour technical support, and global next-day spare-part delivery. Custom cable lengths, actuator shapes, and voltage ratings are available on request.

Conclusion
The IF17B-05-NO limit switch from NANJING ZHUYE ELEVATOR PARTS delivers precise position feedback, robust safety features, and universal compatibility. By choosing this switch, you ensure reliable elevator operation, reduced maintenance costs, and full compliance with international safety standards.