The Original ZENGTAI H-1322 6-Pin Heavy-Duty ON-OFF-ON Toggle Switch (15A 250VAC / 20A 125VAC) is an industrial-grade double-pole double-throw with center-off (DPDT Center-OFF / 3-Position) panel-mount mechanical switch engineered for bidirectional motor control, dual-circuit AC mains isolation, and multi-source changeover. Built with a solid nickel-plated metal bat lever, a high-dielectric flame-retardant phenolic/bakelite insulating base, and arc-resistant silver alloy contacts, it provides positive mechanical detent action with low contact resistance across all three positions. Featuring six heavy-duty brass screw clamp terminals and standard 12mm threaded mounting hardware with an anti-rotation locating ring, the ZENGTAI H-1322 is widely utilized in industrial machinery, reversible DC/AC motor drives (Forward-Stop-Reverse), dual-line generator/mains transfer switches, automotive winches, linear actuators, and heavy-duty electrical control panels.

Specifications

• Brand / Manufacturer: ZENGTAI (Original Heavy-Duty Switch Series)
• Model / Part Number: H-1322 (H1322)
• Switch Type: Heavy-Duty Industrial Bat Lever Toggle Switch
• Circuit / Pole Configuration: DPDT with Center-OFF (Double Pole, Double Throw - 6 Pins / 2 Poles / 3 Positions)
• Switching Function / Operation: 3-Position Maintained / Latching (ON - OFF - ON)
• Electrical Contact Ratings:
  • AC Rating: 15A @ 250V AC / 20A @ 125V AC
  • DC Rating: 15A @ 12V–30V DC (General inductive/resistive switching)
• Contact Material: Silver Alloy Contacts (High electrical conductivity and arc resistance)
• Contact Resistance: ≤ 50 mΩ (Initial at 1A DC)
• Insulation Resistance: ≥ 100 MΩ (at 500V DC)
• Dielectric / Breakdown Voltage: 1500V AC (50/60 Hz for 1 minute between non-connected parts)
• Mechanical Life Expectancy: ≥ 50,000 Cycles
• Electrical Life Expectancy: ≥ 10,000 Operations (at full rated load)
• Actuator Style: Heavy-Duty Nickel-Plated Solid Metal Bat Lever
• Body / Housing Material: High-Dielectric Heat-Resistant Phenolic / Bakelite Casing
• Termination / Connection Type: 6x Heavy-Duty M3.5 Brass Screw Clamp Terminals (Accepts spade lugs, ring terminals, or bare wire)
• Mounting Method: Panel Mount via Threaded Bushing
• Mounting Hole / Cutout Diameter: 12.0 mm to 12.2 mm (Standard 1/2-inch panel hole)
• Bushing Thread: M12 × 0.75 mm
• Operating Ambient Temperature: -25°C to +85°C
• Included Hardware: 2x Hex Nuts, 1x Internal Tooth Lock Washer, 1x ON-OFF-ON Legend Faceplate Nameplate
• Dimensions: Approx. 33 mm × 20 mm × 19 mm (Body only, excluding lever and terminals; Total height approx. 55 mm)
• Weight: Approx. 46 g

Features

• High 15A / 250VAC Heavy-Current Capacity: Built to switch high-power dual-phase AC circuits, heavy DC motor reversal inrush currents, and auxiliary heating elements without contact pitting or welding.
• 3-Position Center-OFF Functionality (ON-OFF-ON): Features a dedicated central neutral/disconnect state, allowing complete dual-line circuit isolation between active switching states.
• DPDT Dual-Pole Independent Switching: Controls two separate circuits simultaneously, enabling dual-conductor switching (Live & Neutral simultaneous isolation) or full H-bridge style DC motor polarity reversal.
• Solid All-Metal Bat Lever: Delivers crisp tactile feedback and positive mechanical detent engagement in all three positions, ensuring dependable operation even with gloved hands.
• Heavy-Duty Screw Terminals: Six high-torque brass screw terminals with captive washers accommodate direct bare wire clamping or secure termination with M3.5 ring/fork crimp lugs without soldering.
• Durable Phenolic Housing: High-temperature, flame-retardant insulating base provides high dielectric isolation and vibration resistance under continuous industrial duty.
• Complete Panel Mounting Kit: Includes dual locking hex nuts, lock washer, and an aluminum "ON-OFF-ON" indicator nameplate with an anti-rotation locating tab.

Common Applications

• Motor Forward / Stop / Reverse Control: Directional control with a dedicated center stop for DC linear actuators, winches, hoist cranes, conveyor belts, and vehicle power jacks.
• Dual-Line Power Transfer (Mains - OFF - Generator): Simultaneous switching and complete isolation of both Live and Neutral conductors between Mains Grid, OFF, and Backup Generator/Inverter lines.
• Industrial Machinery & Automation: 3-way dual-circuit mode selectors (Manual - OFF - Auto), dual-speed industrial blowers, and multi-stage heating systems.
• Automotive, Marine & 4x4 Rigs: Winch in/off/out control panels, dual battery bank selectors (Battery 1 - OFF - Battery 2), and electric boat trim tab controllers.
• Laboratory & DIY Test Benches: Dual-rail polarity inversion, AC/DC load isolation, and multi-rail bench power supply routing.

Usage Tips

• Terminal Layout (DPDT Center-OFF Pinout): The switch features two parallel columns of 3 screw terminals each. The two center terminals are the **Common (COM)** inputs for Pole 1 and Pole 2. In the center position, all terminals are disconnected (OFF). Flipping the lever one way connects both center terminals to the first pair of outer terminals; flipping the other way connects them to the opposite pair.
• DC Motor Polarity Reversal (Forward-Stop-Reverse) Wiring: Connect the DC power supply (+ and -) to the two center common terminals. Connect the motor across the top two outer terminals, and add crisscross jumper wires connecting the top outer terminals to the opposite bottom outer terminals. This provides a complete mechanical H-bridge with a safe center STOP position.
• Secure Terminal Fastening: For high-vibration automotive or industrial machinery environments, crimp stranded wires with **M3.5 fork (spade) or ring terminals** before tightening down the brass screw clamps to ensure low contact resistance and prevent loose wire fraying.
• Panel Anti-Rotation Alignment: Use the included keyed ON-OFF-ON legend nameplate and ensure the locating tab sits inside the panel notch to prevent the switch body from twisting during operation.
• Inductive Load De-rating: When switching heavy inductive loads (transformers, AC induction motors, large solenoids), de-rate the continuous operating current to **50%–60% of rated capacity (approx. 8A–10A)** to handle turn-off voltage transients and startup inrush currents.
• Optional Weatherproof Boot: For outdoor, marine, or dusty workshop installations, an optional M12 threaded silicone/rubber toggle boot seal can be screwed over the metal lever to achieve an IP65 splash-proof seal.