TT Electronics WHS Wirewound High Surge Resistors
TT Electronics / Welwyn WHS Wirewound High Surge Resistors provide defined power and overload ratings for circuits requiring resistance elements with surge and pulse energy capacity. The WHS series features UL94-V0 flameproof protection, radial taped forms, surface mount ZI-form options, and non-inductive types. These resistors include power ratings from 2W to 10W at 25°C and 5 second overload ratings at 25°C from 10W to 50W. The WHS resistors operate within a temperature range from -55°C to +200°C, offer ±200ppm/°C TCR, and offer isolation voltages from 250V to 1000V. The document does not specify particular applications for the WHS Series. These surge resistors are suited for battery chargers, energy meters, and white goods.
Features
- High surge and pulse energy capacity
- Non-inductive version available
- Radial taped configuration
- Surface mount ZI-form configuration
- UL94-V0 flameproof construction
Applications
- Battery chargers
- Energy meters
- Lighting balance
- Medical PSU
- Process control
- White goods
Technical Specifications
| Parameters | Values | |
|---|---|---|
| Isolation Voltage Range | 250V to 1000V | |
| Power Rating Range at 25°C | 2W to 10W | |
| Maximum Thermal Impedance | 110°C/W | |
| Operating Temperature Range | -55°C to +200°C | |
| Temperature Coefficient of Resistance (TCR) | ±200ppm/°C | |
| Resistance Tolerance | <20R | 5% |
| ≥20R | 1%, 2%, 5% | |
WHS Wirewound High Surge Resistors Temperature Rise Graph
