Kokusai Dengyo SA-3602 AC Solenoid

Kokusai Dengyo SA-3602 AC Industrial Solenoid Actuator

The Kokusai Dengyo SA-3602 is an industrial-grade, dual-purpose (push-pull) laminated AC solenoid designed for continuous-duty mechanical actuation in marine engine room plants, automated boiler systems, dynamic brake releases, and heavy-duty industrial machinery. Built with cold-rolled silicon steel laminations to minimize eddy current losses, the SA-3602 delivers a rated suction/thrust force of 39.2 N (4.0 kgf) across a 20 mm mechanical stroke.

The electromagnetic assembly features vacuum-impregnated, resin-cast Class B insulation, providing high dielectric withstand voltage and thermal durability in hot, humid, and high-vibration shipboard environments.

Model Details

• Base Series: SA Series Laminated AC Solenoids
• Model Designation: SA-3602
• Standard Part Numbers (MPN):
  • SA-3602-100V: 100V / 110V AC, 50/60 Hz (3-lead dual-frequency configuration)
  • SA-3602-200V: 200V / 220V AC, 50/60 Hz (3-lead dual-frequency configuration)
• Plunger Type: Bilateral Dual-Action Plunger (T-Core / Conical Seat) with NBR buffer dampener
• Country of Origin: Japan

Terminal Allocation & Wiring Configuration

The SA-3602 uses heat-resistant UL-1015 vinyl-insulated flying leads:

• 3-Lead Dual Frequency / Dual Voltage Field Wiring:
  • Lead 1 (Common – Neutral / Line 1): Main supply common.
  • Lead 2 (50 Hz Tap): Connect to Live feed for 50 Hz power grids to maintain proper impedance and prevent coil saturation.
  • Lead 3 (60 Hz Tap): Connect to Live feed for standard 60 Hz marine auxiliary power distribution (440V step-down to 100V/110V).
• Grounding: External chassis grounding stud on the laminated frame baseplate. Must be bonded directly to the local machinery earthing bus.

Key Features

1. High Linear Force Density: Generates a full 39.2 N (4.0 kgf) holding force over a 20 mm stroke path.
2. Low-Loss Laminated Core: High-permeability silicon steel plates reduce core heating and prevent residual magnetism lockups.
3. Resin-Encapsulated Coil: Moisture-, oil-, and dust-resistant Class B winding insulation engineered for high ambient engine spaces.
4. Dual Push/Pull Action: Symmetrical plunger shaft allows either direct pull actuation or rear-push rod coupling.
5. Integral NBR Impact Absorbers: Internal nitrile dampeners mitigate plunger slamming wear and acoustic noise during rapid cycling.

Applications

• Marine Boiler Control Systems: Composite boiler dump valve actuators, flame damper triggers, and soot-blower tripping linkages.
• Engine & Machinery Tripping: Fuel rack emergency shut-off valves and governor interlock overrides.
• Electromechanical Braking Systems: Holding brake release mechanisms on marine winches, overhead crane hoist drums, and elevator shafts.
• Industrial Pneumatics & Hydraulics: Direct mechanical lever pilots for large valve spools and process diverting gates.
• Packaging & Conveyor Diversion: High-speed mechanical lane diverters, sorting stops, and gate lockouts.

Compatible Machinery & Systems

• Marine Auxiliary Boilers (Miura, Aalborg, KangRim, Volcano burner safety systems)
• Shipboard Cargo Cranes and Mooring Winch electromagnetic brake bands
• Diesel generator emergency air flap actuators (Yanmar, Daihatsu, MAN B&W auxiliary engines)

Cross-Reference / Equivalent Models

• Kokusai Dengyo: SA-3502, SA-3602, SA-3702, SA-2602, SAL-03
• Toyo Denki / Shindengen equivalents: AS-3602, AC Traction Solenoid Series 4kgf-20mm
• Direct Form-Fit Replacement: Standardized 4-hole mounting footprint conforms to JIS C 4552 / JEM 1184 industrial standards.

Frequently Asked Questions

What happens if the SA-3602 mechanical load exceeds 39.2 N (4.0 kgf)?

If the mechanical counter-force exceeds the rated pulling/pushing capacity, the plunger will fail to seat fully against the magnetic core face. In an AC solenoid, incomplete seating prevents the coil from developing inductive reactance, locking it in the 10 A inrush current stage. This will trigger the circuit breaker or cause thermal burnout of the winding within minutes.

Can the SA-3602 be operated on DC power systems?

No. The SA-3602 is engineered strictly for single-phase AC power supplies (50 Hz / 60 Hz). Applying equivalent DC voltage will cause destructive overcurrent because the coil relies on AC inductive reactance to limit current to its 0.9 A holding value. For DC systems, source dedicated DC models such as the SD or SAL DC series.

How do I tell if a failed SA-3602 solenoid needs replacement vs. cleaning?

Measure the coil resistance with a multimeter and check the insulation resistance using a 500V DC megger tester. If the winding shows open-circuit, short-circuit, or insulation resistance below 100 MΩ, the coil has failed and requires replacement. If electrical parameters are nominal but the unit chatters or sticks, clean debris from the plunger path and verify mechanical linkage alignment.