Resistance: 3.9k Ohms. Power: 25W. Resistor type: electric wire winding. Temperature stability: 50ppm/°C. Configuration: horizontal mounting with axial connections. Operating Voltage: 550V. Dimensions: 27.3x28x14.6mm, distance between mounting holes 18.3x19.8mm. RoHS: yes. Series: WH25. Housing (according to data sheet): Metal housing with cooling fins. Tolerance: 5%