Honeywell 05701-A-0405

Description

Actuator Type: Short-Travel Plunger with 0.5″ (12.7 mm) Diameter Tip
Plunger Travel: 0.187″ (4.75 mm) total travel
Operating Force: 2 lbs (8.9 N) max at plunger tip
Release Force: 0.4 lbs (1.8 N) min at plunger tip
Overtravel: 0.031″ (0.8 mm) positive / 0.005″ (0.13 mm) negative
Operating Speed: 0.1 to 10 inches per second (2.5 to 254 mm/s)
Plunger Tip Material: Stainless steel 304 (standard); Delrin (acetal) available as option

Operating Temperature Range: -40°C to +85°C (-40°F to +185°F)
Storage Temperature Range: -50°C to +90°C (-58°F to +194°F)
Ambient Humidity: 5% to 95% RH, non-condensing
Vibration Tolerance: 10–500 Hz, 10 g (operating); 10–500 Hz, 20 g (survival)
Shock Tolerance: 50 g, 11 ms half-sine pulse
Ingress Protection: IP67 (body); IP66 with cover mated
Enclosure Rating: NEMA 4, 4X, 12, 13

Housing Material: Zinc die-cast alloy with epoxy-polyester powder coat finish (standard green)
Internal Contact Material: Silver alloy (AgSnO₂) for high-current switching
Terminals: Brass alloy, tin-plated
Plunger Tip: Stainless steel 304 (standard); Delrin (acetal) or Nylon 6/6 available
Seals: Silicone rubber (standard); FKM (Viton) available as option
Mounting Hardware: Stainless steel 304 screws included

Structure:

• Compact rectangular body (approximately 2.25″ × 1.75″ × 1.5″ / 57 mm × 44 mm × 38 mm)
• Top-mounted plunger actuator with sealed guide tube
• Cable entry: 1/2″ NPT conduit fittings (top and bottom)
• Prewired leads: 18 AWG, 6″ (152 mm) long, color-coded (red, black, white)
• Terminal type: Quick-connect spade terminals (0.250″ / 6.35 mm)
• Weight: Approximately 0.45 lbs (0.20 kg)

Working Principle:
The switch contains an internal snap-action mechanism with a spring-loaded over-center contact assembly. When the external plunger tip is depressed by a machine part, it pushes the internal actuator rod downward. At the switch point (actuation point), the over-center spring mechanism releases stored energy, causing the contacts to snap rapidly from one position to the other. This snap action ensures fast, clean contact transition (less than 1 ms) regardless of actuator speed within the specified range. The positive overtravel guarantees complete contact closure even if the actuating force continues after the switch point.

Key Features:

• Heavy-duty 15 A SPDT contact rating — handles high inductive and resistive loads directly
• Short-travel plunger actuator — compact footprint, ideal for tight-space installations
• IP67 / NEMA 4X sealed body — fully protected against water ingress and dust
• Adjustable switch point — internal cam position can be set to tune the actuation point
• Stainless steel plunger tip — resists corrosion, wear, and impact
• Quick-connect spade terminals — fast wiring, no tools required
• 10 million cycle mechanical life — extremely long service life in continuous duty

Advantages:

• Fast snap-action (less than 1 ms contact transition) prevents arcing, contact welding, and electrical noise
• High 15 A contact rating eliminates the need for interposing relays in most applications
• Plunger actuator provides axial force resistance — superior to lever types in high-vibration environments
• IP67 / NEMA 4X enclosure — suitable for outdoor, washdown, and food-grade environments
• Compact size fits into tight machine enclosures where lever switches cannot reach
• Long mechanical life (10M cycles) drastically reduces maintenance frequency and downtime
• Adjustable actuation point allows field tuning without replacing the switch

Applicable Industries:

• Manufacturing / Machine Tools — end-of-travel detection on presses, stamping machines, CNC equipment
• Material Handling — conveyor position sensing, hoist limit detection, crane travel stops
• Food & Beverage — washdown-rated positions on packaging, bottling, and processing lines
• Mining & Heavy Equipment — boom, bucket, and cylinder position limits on excavators and loaders
• Power Generation — valve position feedback, turbine governor limits, breaker mechanism detection
• Automotive — assembly line position sensing, robotic cell interlocks, welding fixture stops
• Oil & Gas — valve actuation feedback, pump control interlocks, pipeline pig detection
• Pulp & Paper — paper guide position sensing, roller travel limits
• Water / Wastewater — valve and gate position control in treatment and distribution systems

Model Series:

Contact Configuration:

Installation Requirements:

• Mount the switch on a rigid, vibration-free surface using the provided 1/2″ mounting holes
• Align the plunger tip so that the actuating surface contacts the plunger perpendicular to the travel axis at the desired switch point
• Set the actuation point by adjusting the internal cam position before final tightening
• Use 1/2″ NPT conduit for cable entry; seal unused entries with the provided plugs
• Connect wires to quick-connect spade terminals; ensure connections are tight to prevent arcing
• Provide a dedicated ground connection if the switch is used in a safety-rated circuit
• Maintain a minimum 0.5″ (12.7 mm) clearance around the plunger for free movement

Usage Precautions:

• Do not exceed the rated contact current of 15 A — overloading will weld contacts and destroy the switch
• Do not operate the switch without the plunger tip in contact with the actuating surface — free plunger movement causes premature internal wear
• Do not apply side loads greater than 3 lbs (13.3 N) to the plunger tip — this will bend the guide tube
• Do not disassemble the switch in hazardous (classified) areas unless the unit carries the appropriate certification
• Verify contact configuration (NO/NC) matches the control circuit before energizing
• Perform periodic inspection of the plunger tip and seal for wear, cracks, or corrosion
• Replace the switch if the plunger tip shows flat spots, the guide tube is bent, or contacts show pitting or welding
• Do not use in temperatures below -40°C or above +85°C — seal integrity and contact performance are not guaranteed outside this range
• Do not exceed 100 psi (6.9 bar) washdown pressure — direct high-pressure jet can force water past the seal over time

Certifications:

• UL Listed (File E29549)
• CSA Certified (File LR42403)
• CE Marked (Low Voltage Directive 2014/35/EU, EMC Directive 2014/30/EU, Machinery Directive 2006/42/EC)
• RoHS Compliant (Directive 2011/65/EU)
• IP67 (IEC 60529)
• NEMA 4, 4X, 12, 13 (UL 50 / NEMA 250)

Documentation Reference:

• Honeywell Micro Switch Heavy-Duty Snap-Action Catalog (Document 5000-001)
• Honeywell 05701 Series Installation Manual (Document 50701-IM-001)
• Honeywell Limit Switch Selection Guide (Document 5000-SG-001)
• Honeywell 05701 Series Technical Data Sheet (Document 50701-TDS-001)

Replacement Parts: