The main electric conduction loop of the circuit breaker (TZN1-12 series) is casted with epoxy resin by APG technics, embedding its vacuum arc extinguish chamber and main loop as an integration. Thereby, its insulation performs with high strength, the size is small, and the surface of its vacuum arc extinguishing chamber avoids the influence of ambient environment, realizing the maintenance-free purpose. Main features:

• small size,
• water-condensation proof,
• high insulation,
• pollution-proof,
• low resistance,
• free maintenance.

• Ambient temperature: -15 ℃ ～ +40 ℃
• Altitude: ≤1000m
• Relative humidity: daily average relative humidity ≤ 95%; monthly average relative humidity ≤ 90%
• Free from fire, explosion, heavy pollution, chemical corrosion and severe vibration.
• Earthquake intensity ≤ 8 degree
• If the service condition differs from the above , the user should consult it with manufacturer.