00046791 Bürkert: Specialized Connector for AC Solenoids
The 00046791 (Type 2508) is a high-performance cable plug designed for the electrical connection of solenoid valves. What distinguishes this specific 46791 variant is the integrated bridge rectifier. This component is essential for operating DC-rated solenoid coils with an AC power supply, or for smoothing the switching performance of AC-driven valves. By converting alternating current to a stable direct current signal within the plug itself, it reduces acoustic humming (AC buzz) and significantly extends the life of the solenoid coil by preventing thermal spikes during high-frequency operation.
Key Technical Characteristics
- Type: 2508 Connector (Form A).
- Voltage Range: 0 – 240 V AC/DC.
- Integrated Circuit: Bridge Rectifier (Graetz circuit).
- Protection Class: IP65 (when plugged and secured).
- Contact Spacing: 18 mm (Standard Industrial Form A).
- Cable Outlet: M20 Gland for secure sealing.
Maintenance & Electrical Integration
Lifecycle State: Active. Diagnosis: If a solenoid valve hums loudly or fails to energize despite having power at the cable, the rectifier inside the 46791 plug may have failed due to a voltage surge. Testing the output pins with a DC voltmeter while the AC supply is connected will confirm functionality. Installation Advice: Ensure the flat gasket is positioned correctly between the plug and the coil to maintain the IP65 rating. The central screw should be tightened to 1 Nm to ensure electrical contact without cracking the plastic housing. Compatibility: Universally compatible with all Bürkert, Festo, and SMC coils that follow the DIN EN 175301-803 Form A standard. It is often used in Siemens S7-1200 systems where AC outputs are used to drive quiet-operation DC valves.
| Feature | Value |
|---|---|
| Continuous Current | Max 1.0 A |
| Number of Pins | 2 + Protective Earth (PE) |
| Housing Material | Polyamide (PA) |
| Ambient Temp | -40°C to +90°C |
Technical Insight
The use of a rectified plug like the 46791 is a «best practice» for reducing electromagnetic interference (EMI) in sensitive industrial environments where analog sensors are present.
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