Non-Electric Protection Devices
Mechanical and monitoring devices that protect transformers from pressure surges, gas buildup, and abnormal oil or winding conditions.
YSF20 Series Pressure Relief Device
Pressure relief device for large oil-immersed power transformers, capacitors, and reactors, with optional dual electrical alarm signal output.
QYW Series Multi-function Protector
Dedicated protective relay for fully sealed transformers, combining gas, oil level, and pressure protection with remote temperature display.
QNJ Series Capsule Rupture Relay
Protective relay for on-load tap changers, reactors, and oil-immersed power transformers fitted with capsule oil storage tanks.
YWZ Series Oil Level Gauge
Combined oil level and oil temperature testing device for transformer oil tanks, with dial indication for both readings.
YSF9-80D/130D Series Pressure Relief Device
Pressure relief device with transmission signal for large oil-immersed power transformers, capacitors, and reactors.
YSF9-25K/50K Series Pressure Relief Device
Compact pressure relief device (under Φ50mm) for protecting oil tanks of transformers, switches, capacitors, reactors, and tap changers.