... Wholesale Switch 250V 1) Specification:1. Material: alum. Frame + Steel Strengthen Plate + Silver alloy contact material** Alum. Frame: fire retardant, no electric ... Phosphor Bronze: high resilience, antioxidant, good electric conductivity** Brass: good electric conductivity2. Rating: 250V, 10A3. 1 ... There are lifespan test, insulation resistance test, electric strength test, heat test , etc.Qulity is ...