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Threaded Diode ZP300A 200A 100A 50A 30A 1600V Power Positive Stud Mount Rectifier Diode 200V-3000V Welding Machines Parts
Threaded Diode ZP300A 200A 100A 50A 30A 1600V Power Positive Stud Mount Rectifier Diode 200V-3000V Welding Machines Parts
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ZP Series Threaded Stud Mount Rectifier Diode — 30A to 300A, 200V to 3000V
Industrial-grade positive stud mount rectifier diodes in the ZP series, featuring a glass-passivated silicon chip, brass threaded stud body, and hydrogen arc welding construction for maximum reliability in high-current rectification applications. Available in current ratings from 30A to 300A and voltage ratings from 200V to 3000V, covering the full range of single-phase and three-phase bridge rectifier requirements in welding machines, electroplating power supplies, and industrial motor drives.
Variant Selection Table
| Model | Average Rectified Current (IF) | Repetitive Peak Reverse Voltage (VRRM) | Stud Diameter |
|---|---|---|---|
| ZP10A | 10A | 200V–3000V selectable | M8 |
| ZP20A | 20A | 200V–3000V selectable | M10 |
| ZP30A | 30A | 200V–3000V selectable | M10 |
| ZP50A | 50A | 200V–3000V selectable | M12 |
| ZP100A (12mm) | 100A | 200V–3000V selectable | M12 |
| ZP100A (16mm) | 100A | 200V–3000V selectable | M16 |
| ZP200A | 200A | 200V–3000V selectable | M20 |
| ZP300A | 300A | 200V–3000V selectable | M24 |
Technical Specifications
| Parameter | Value |
|---|---|
| Chip Technology | Glass-passivated silicon (GP chip) |
| Stud Material | Brass (copper alloy), threaded positive stud |
| Construction | Hydrogen arc welding (H-arc), hermetically sealed |
| Junction Temperature (TJ) | −40°C to +150°C |
| Storage Temperature (TSTG) | −40°C to +150°C |
| Forward Voltage Drop (VF) | ≤1.2V (typical at rated IF) |
| Mounting | Threaded stud (positive polarity), nut-and-washer |
| Cooling | Heatsink required (bolt-on to aluminium heatsink) |
| Certification | CE, RoHS |
Typical Applications
- Welding Machines: Primary rectification in MIG, MMA, and TIG welding power supplies. ZP100A–ZP300A variants handle the high-current DC bus in industrial welding inverters and transformer-based welders.
- Electroplating & Anodising Power Supplies: High-current DC rectification for electroplating baths, anodising tanks, and electrolytic processes requiring stable low-ripple DC at 50–300A.
- Three-Phase Bridge Rectifiers: Used in sets of 6 (3 positive + 3 negative stud diodes) to build three-phase full-wave bridge rectifiers for industrial motor drives and UPS systems.
- Battery Charging Systems: High-current charger rectification for lead-acid, NiCd, and industrial battery banks in forklift, telecom, and backup power applications.
- Excitation Systems: Rotating rectifier assemblies in synchronous generator excitation circuits, where stud-mount diodes are mounted on the rotating shaft.
- Power Electronics Repair: Direct replacement for failed stud-mount diodes in existing industrial equipment without redesigning the heatsink assembly.
Installation Notes
- Mount stud into an aluminium heatsink with thermal compound (e.g., Dowsil TC-5026) for optimal thermal performance
- Torque stud nut to manufacturer specification (typically 15–25 N·m depending on stud size) — over-tightening can crack the ceramic body
- Positive stud polarity: stud = anode (+), body/lead = cathode (−)
- Always use a snubber RC circuit (e.g., 0.1µF + 10Ω) across the diode in inductive load applications to suppress voltage spikes
- Derate current by 50% when operating above 100°C case temperature
FAQ
Q: What is the difference between ZP100A 12mm and ZP100A 16mm?
A: Both are rated at 100A average rectified current. The 12mm variant uses an M12 threaded stud for standard heatsink mounting; the 16mm variant uses an M16 stud for higher-torque mounting in heavy industrial assemblies with larger heatsink bores.
Q: Can I use a ZP300A diode in a single-phase bridge rectifier?
A: Yes. A single-phase full-wave bridge requires 4 diodes (2 positive + 2 negative stud). For a 300A DC output, use ZP300A positive stud diodes paired with equivalent negative stud diodes (e.g., ZK300A or equivalent).
Q: What voltage rating should I select for a 220V AC input?
A: For 220V AC single-phase input, the peak voltage is 220 × √2 ≈ 311V. Apply a 2× safety factor: select at least 600V (VRRM). For three-phase 380V AC, peak line voltage ≈ 537V — select 1200V or higher.
Package Contents
- 1 × ZP series stud mount rectifier diode (model and voltage as selected)
