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SQL50A 3-Phase Diode Bridge Rectifier — 50A 1200V Aluminum Case
SQL50A 3-Phase Diode Bridge Rectifier 50A 1200V Aluminum Case
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SQL50A — 50A 1200V 3-Phase Diode Bridge Rectifier
The SQL50A is a high-current 3-phase diode bridge rectifier module rated at 50A continuous current and 1200V peak reverse voltage. Housed in a robust aluminum metal case with bolt-down mounting, it converts 3-phase AC power to DC with high efficiency — essential for industrial motor drives, welding equipment, UPS systems, and high-power DC power supplies.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | SQL50A |
| Configuration | 3-Phase Bridge Rectifier (6-diode) |
| Average Output Current (IO) | 50A |
| Peak Reverse Voltage (VRRM) | 1200V |
| Forward Voltage Drop (VF) | ~1.1V per diode |
| Surge Current (IFSM) | 500A (8.3ms) |
| Package | Aluminum metal case (bolt-down) |
| Mounting | Screw terminal + bolt-down to heatsink |
| Operating Temperature | -40°C to +150°C (junction) |
| Condition | New, Original |
| Origin | Mainland China |
Why Choose SQL50A?
- 50A continuous rating — handles high-current industrial loads without derating
- 1200V VRRM — safe margin for 3-phase 380V/480V mains applications
- Aluminum case — direct bolt-down to heatsink for efficient thermal management
- 500A surge capability — withstands inrush current from capacitive loads and motor starts
- Screw terminals — secure, vibration-resistant connections for industrial environments
- 3-phase input — lower ripple and higher efficiency vs single-phase rectification
Typical Applications
- Industrial motor drives (VFD) — 3-phase AC to DC bus conversion for variable frequency drives
- Welding machines — high-current DC rectification for MIG, TIG, and stick welders
- UPS systems — 3-phase input rectifier for uninterruptible power supplies
- High-power DC power supplies — industrial bench supplies and battery chargers
- Electroplating equipment — high-current DC for electrochemical processes
- CNC machine power stages — servo drive and spindle motor power conversion
Installation Notes
Mount the SQL50A directly to an aluminum heatsink using thermal compound for optimal heat dissipation. At full 50A load, a heatsink with thermal resistance ≤0.5°C/W is recommended. Use M5 or M6 bolts for secure mounting. Connect 3-phase AC inputs to terminals marked ~ (or A, B, C) and DC output from + and − terminals.
FAQ
Q: What 3-phase voltage can SQL50A handle?
A: With 1200V VRRM, it safely handles 3-phase 380V (peak ~537V) and 480V (peak ~679V) mains with adequate safety margin.
Q: Does SQL50A require a heatsink?
A: Yes. At currents above 10–15A, a heatsink is required to keep junction temperature within safe limits. The aluminum case facilitates direct heatsink mounting.
Q: What is the ripple frequency of the output?
A: 3-phase bridge rectification produces 6× line frequency ripple (300Hz for 50Hz mains, 360Hz for 60Hz mains) — much lower ripple than single-phase designs.
Package Contents
- 1× SQL50A 3-Phase Diode Bridge Rectifier Module (aluminum case)
