51ML1-E1 | Honeywell Heavy-Duty SPDT Limit Switch with Roller Lever, 20A 600VAC
Honeywell · Relays, Contactors & Switches
Description The Honeywell 51ML1-E1 is a single-pole double-throw (SPDT) heavy-duty limit switch with a nylon roller lever designed for reliable position sensing in industrial environments. Featuring a durable die-cast alloy housing and threaded conduit entry, it ensures safe operation even in hazardous locations. This switch provides high performance with precise travel characteristics and robust electrical ratings for demanding control applications. Technical Specifications Condition New/Never Used Surplus Brand Honeywell Category Sensors & Switches Part Number 51ML1-E1 Subcategory Limit Switch Operator Configuration Standard Head/Operator Side Rotary Roller Lever Operating Force 3 lb (13.3 N) Type Heavy-Duty Hazardous Location Limit Switch Head Action Spring Return, Standard Poles/Contacts SPDT (1 NO / 1 NC) Current Rating 20A Voltage Rating 600 VAC / 230 VDC Travel Direction CW or CCW Pre-Travel 12° Maximum Differential Travel 4° Maximum Over-Travel 60° Minimum Body Construction Die-Cast Alloy Connection Type Threaded Entry Connection Size 1/2 in. NPT Environmental Rating NEMA A600 Hazard Classification Class I, Groups C & D; Class II, Groups E, F & G Weight 2.34 lbs Information About 51ML1-E1 The 51ML1-E1 is part of Honeywell’s MICRO SWITCH™ ML Series of heavy-duty limit switches built for hazardous locations and industrial automation. It features a side rotary roller lever actuator with spring-return action, suitable for applications requiring accurate position feedback under mechanical or environmental stress. The die-cast alloy construction offers excellent durability, while the threaded entry design allows for secure conduit connection. With a SPDT contact configuration and 20A rating, this unit delivers dependable switching performance in both AC and DC circuits. Key Features: SPDT Contact Configuration: Provides one normally open and one normally closed contact for flexible control logic. Heavy-Duty Construction: Die-cast alloy housing ensures long-term durability in demanding industrial environments. Hazardous Location Rated: Certified for Class I, Groups C and D, and Class II, Groups E, F, and G hazardous areas. High Current Capacity: Handles up to 20 amps at 600 VAC, supporting a wide range of power and signal applications. Precision Travel Control: Features 12° maximum pre-travel, 4° differential, and 60° over-travel for accurate operation. Rugged Roller Lever Operator: Nylon roller lever allows smooth and consistent actuation with minimal wear. Threaded Electrical Entry: 1/2" NPT conduit entry ensures secure wiring connections and easy installation. Wide Operating Range: Suitable for clockwise or counterclockwise travel direction with spring-return mechanism. Reliable Electrical Performance: NEMA A600 rated for industrial use, offering dependable contact integrity under load. Industrial-Grade Design: Built for machinery, conveyor systems, and control panels requiring dependable limit sensing. The 51ML1-E1 delivers the reliability and precision required for industrial automation and hazardous environment position control.
Brand: Honeywell · Category: Relays, Contactors & Switches
Key features
- SPDT Contact Configuration: Provides one normally open and one normally closed contact for flexible control logic.
- Heavy-Duty Construction: Die-cast alloy housing ensures long-term durability in demanding industrial environments.
- Hazardous Location Rated: Certified for Class I, Groups C and D, and Class II, Groups E, F, and G hazardous areas.
- High Current Capacity: Handles up to 20 amps at 600 VAC, supporting a wide range of power and signal applications.
- Precision Travel Control: Features 12° maximum pre-travel, 4° differential, and 60° over-travel for accurate operation.
- Rugged Roller Lever Operator: Nylon roller lever allows smooth and consistent actuation with minimal wear.
- Threaded Electrical Entry: 1/2" NPT conduit entry ensures secure wiring connections and easy installation.
- Wide Operating Range: Suitable for clockwise or counterclockwise travel direction with spring-return mechanism.
- Reliable Electrical Performance: NEMA A600 rated for industrial use, offering dependable contact integrity under load.
- Industrial-Grade Design: Built for machinery, conveyor systems, and control panels requiring dependable limit sensing.
Specifications
| Manufacturer part number | 51ML1-E1 |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Honeywell |
| Category | Sensors & Switches |
| Part Number | 51ML1-E1 |
| Subcategory | Limit Switch |
| Operator Configuration | Standard |
| Head/Operator | Side Rotary Roller Lever |
| Operating Force | 3 lb (13.3 N) |
| Type | Heavy-Duty Hazardous Location Limit Switch |
| Head Action | Spring Return, Standard |
| Poles/Contacts | SPDT (1 NO / 1 NC) |
| Current Rating | 20A |
| Voltage Rating | 600 VAC / 230 VDC |
| Travel Direction | CW or CCW |
| Pre-Travel | 12° Maximum |
| Differential Travel | 4° Maximum |
| Over-Travel | 60° Minimum |
| Body Construction | Die-Cast Alloy |
| Connection Type | Threaded Entry |
| Connection Size | 1/2 in. NPT |
| Environmental Rating | NEMA A600 |
| Hazard Classification | Class I, Groups C & D; Class II, Groups E, F & G |
| Weight | 2.34 lbs |
| Product type | Limit Switch |
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