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442L-SFZNMZ /B

The Allen-Bradley 442L-SFZNMZ/B is a heavy-duty limit switch from the Bulletin 442L series, featuring a stainless steel housing (Type 4X/13) for corrosion resistance and IP67 protection. It includes a slow-operate snap-action mechanism, 1NO + 1NC contacts, and a roller lever actuator, designed for harsh industrial environments like mining, marine, and outdoor applications.

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Electrical Ratings:
Contact Configuration: 1NO (Normally Open) + 1NC (Normally Closed)

Rated Current:

AC: 10A @ 600V (resistive) / 6A @ 600V (inductive)

DC: 10A @ 30V (resistive) / 1A @ 125V (inductive)

Contact Material: Silver alloy (self-cleaning)

Insulation Resistance: 100MΩ min (at 500V DC)

Dielectric Strength: 1,500V AC (50/60Hz, 1min)

Mechanical Characteristics:
Actuator Type: Roller lever (ZNM) with maintained position

Operating Force: 1.5–2.5 lbf (lever-dependent)

Mechanical Life: 5 million operations (no load)

Electrical Life: 500,000 operations (rated load)

Pretravel/Travel: Adjustable (lever-specific)

Environmental & Protection:
Housing Material: 316 stainless steel (corrosion-resistant)

Protection Rating: IP67 (dustproof/waterproof) / Type 4X/13 (NEMA)

Operating Temperature: -40°C to +85°C

Humidity: 0–100% RH (condensing)

Shock Resistance: 100G (11ms)

Vibration Resistance: 10–55Hz, 1.5mm amplitude

Terminals & Wiring:
Terminal Type: Screw-clamp (with captive screws)

Wiring Capacity: 14–12 AWG (2.5mm²)

Conduit Entry: 1/2" NPT (standard)

Dimensions & Weight:
Body Size: 44.5 × 101.6 × 44.5mm (1.75 × 4 × 1.75")

Actuator Length: Varies by lever type (~80mm typical)

Weight: ~0.9kg (with actuator)

Certifications & Compliance:
UL Listed (UL508)

CSA Certified

CE Marked (EN 60947-5-1)

RoHS/REACH Compliant

Applications:
Harsh environments (marine, mining, oil/gas)

Outdoor machinery (cranes, conveyors)

Washdown areas (food processing, chemical plants)