Genuine Icom Matsushita Power Switching Relay for Antenna Tuner and Power Supply
The Icom 6330000570 is a professional-grade power relay manufactured by Matsushita (now Panasonic) and designated AR39251, specifically used in the Icom AH-2 automatic antenna tuner and PW-1 power supply unit. This sealed PCB-mount relay features a 12VDC coil and DPDT (Double Pole Double Throw) contact configuration rated for 10 amperes at 250VAC, making it suitable for switching antenna paths, power circuits, or control signals in radio equipment. The model JC2aF-DC12V designation indicates a high-reliability design with sealed contacts that resist contamination from dust, moisture, and RF energy. The durable plastic housing protects internal components while the multiple terminal pins provide secure PCB mounting and reliable electrical connections.
Key Features
- Genuine Icom OEM relay manufactured by Matsushita (Panasonic) ensures reliable performance and longevity
- 12VDC coil voltage compatible with standard radio equipment power supplies
- 10A at 250VAC contact rating handles high-power switching applications safely
- DPDT contact configuration enables complex switching logic or dual-circuit control
- Sealed plastic housing protects contacts from environmental contamination and RF interference
- PCB mount design with five through-hole pins provides secure mechanical and electrical connections
- JC2aF series construction offers high reliability and long operational life
Technical Specifications
- Component Type: Electromechanical Power Relay
- Manufacturer: Matsushita (Panasonic)
- Model: JC2aF-DC12V
- Part Number: AR39251
- Coil Voltage: 12VDC
- Contact Rating: 10A at 250VAC
- Contact Configuration: DPDT (Double Pole Double Throw)
- Mounting Style: PCB mount (through-hole pins)
- Housing: Sealed black plastic enclosure
- Terminal Count: Five PCB pins
Compatible Applications
- Icom AH-2 Automatic Antenna Tuner
- Icom PW-1 Power Supply Unit
What's Included
- One (1) Icom 6330000570 Matsushita Power Relay AR39251
Application and Installation Notes
This power relay serves critical switching functions in Icom radio equipment, typically controlling antenna paths in the AH-2 automatic antenna tuner or power distribution in the PW-1 power supply. In antenna tuner applications, the relay switches between different antenna configurations or bypasses tuning circuits depending on operational requirements. The 10-ampere contact rating provides adequate capacity for RF power switching in HF transceiver installations up to approximately 100 watts, while the sealed contact design prevents RF energy from causing contact arcing or degradation. The 12VDC coil voltage matches standard control voltages used in amateur radio equipment, allowing direct control from microcontroller outputs or logic circuits.
Professional installation by qualified radio technicians or experienced electronics repair specialists is essential. Access the appropriate circuit board following manufacturer service procedures, carefully disassembling the AH-2 tuner or PW-1 power supply to expose the relay mounting location. Identify the failed relay and carefully desolder all five terminal pins using appropriate desoldering technique - either a desoldering pump, solder wick, or desoldering station. Excessive heat or prolonged heating can damage the circuit board, so use proper temperature control and work efficiently. Remove the old relay and clean all PCB holes thoroughly to remove residual solder.
Insert the new AR39251 relay with correct orientation, carefully aligning all five pins with their corresponding PCB holes. Verify proper seating of the relay body against the circuit board before soldering. Solder each pin individually, ensuring good wetting and proper solder joints without bridges between adjacent pins. Pay special attention to the heavier pins that may carry higher current loads, ensuring adequate solder for reliable electrical and thermal performance. After installation, inspect all joints for quality and verify no solder bridges or cold solder joints exist.
Before reassembling the equipment, test relay operation if possible using appropriate test equipment or by temporarily powering the circuit. Listen for the characteristic "click" of the relay armature when 12VDC is applied to the coil terminals, and verify proper contact closure using a multimeter in continuity mode. Confirm that all switched circuits operate correctly and that contact resistance is minimal (typically less than 0.1 ohms for new relays). If the relay fails to actuate or shows high contact resistance, remove and reinstall, checking for proper pin seating and solder connections.
This relay should be replaced when troubleshooting antenna tuner failures, intermittent antenna switching, power supply control problems, or when clicking sounds indicate relay operation but circuits do not switch properly. Common failure modes include welded contacts (relay stuck in one position), open coil (no clicking sound when voltage applied), or high contact resistance (voltage drop or heating during operation). Symptoms may include inability to tune certain bands, intermittent antenna connection, power supply sequencing failures, or burnt smell from overheated contacts. Always use genuine Icom/Matsushita replacement relays to ensure proper contact rating, coil characteristics, and mechanical fit.
Ideal for authorized Icom service centers, professional radio repair technicians, antenna tuner specialists, and experienced amateur radio operators with electronics repair skills maintaining AH-2 antenna tuners or PW-1 power supplies used in amateur radio, emergency communications, or professional HF radio installations.
Manufacturer Part Number: 6330000570
Relay Designation: AR39251
Relay Model: Matsushita JC2aF-DC12V
Applications: AH2 PW1
