Overview
The Honeywell BZLN-2-RH limit switch is a reliable industrial-grade position sensor designed for machinery control and equipment safety. This top-actuated limit switch features a roller arm actuator and SPDT snap-action contacts. Though discontinued by the manufacturer, this unit remains a proven solution for retrofit applications where precision position sensing and fast switching are required.
Key Features
- Top Roller Arm Actuator — Adjustable roller configuration for sensitive and repeatable actuation
- SPDT Snap Action — 1 Normally Open / 1 Normally Closed contact for flexible circuit design
- High Current Rating — 15A @ 480VAC; supports multiple voltage levels (125/250/480VAC; 125/250VDC)
- Zinc Die-Cast Housing — Durable construction rated NEMA 1, 3, 4, 13 for indoor and outdoor use
- Pre-Wired Leads — #14 HWM wire for quick integration
- Certified Components — UL recognized (File #E12252) and CSA certified (File #LR41372)
Technical Specifications
- Actuator Type: Top Roller Arm (Adjustable)
- Contact Configuration: SPDT (1 NO / 1 NC)
- Voltage Rating AC: 125 VAC / 250 VAC / 480 VAC
- Voltage Rating DC: 125 VDC / 250 VDC
- Current Rating AC: 15 A Ind. / 0.5 A Res.
- Current Rating DC: 0.25 A Res.
- Operating Force Max: 13.3 N (3 lb)
- Pretravel Max: 1.98 mm (0.078 in)
- Differential Travel Max: 0.36 mm (0.014 in)
- Operating Temperature: -25°C to +55°C (-13°F to +131°F)
- Housing Material: Zinc Die-Cast
- Sealing Rating: NEMA 1, 3, 4, 13
- Termination: Pre-Wired with #14 HWM Leads
- Weight: 0.85 lbs
- Dimensions: 103.1 mm L × 49.53 mm H × 25.4 mm D
Typical Applications
The BZLN-2-RH is widely used for:
- Conveyor system position sensing and stop/start control
- Press and punching machine stroke limit detection
- Door and gate position monitoring
- Machine guard and safety interlock circuits
- Industrial automation equipment feedback
- Machinery impact and travel limit sensing
Compatibility & Replacements
Compatible With
- Industrial machinery control systems requiring 480VAC rated limit switches
- PLC discrete input modules (24VDC auxiliary circuits)
- Relay-based control circuits and safety interlocks
- NEMA enclosures and control panels (IP54+ environments)
- Standard 24VDC machine control power supplies
Replaces / Drop-In Replacement For
- Original Honeywell BZLN-2-RH units (part numbers BZLN2RH, BZLN-2-RH)
- Alternative part designations: BZLN-2-RH3 (variant with additional features)
- Similar Micro Switch BZLN series roller arm limit switches
Works With
- Industrial relay logic and hardwired control systems
- Pneumatic and hydraulic machine controls
- PLC discrete input card modules (with appropriate input voltage conversion)
- Motor starter circuits and overload protection schemes
- General machinery automation and safety circuits
