Product Description 1.Application: Air preheating for electric bus 2.Characteristics: Self-regulation PTC element, heater will not be damaged without air flow Multiple insulation, electric strength can reach 2500VAC, leak current is less than 5mA Voltage can be selected from 250~600VDC, up to 900VDC Excellent low temperature start performance, it can rapid heating even under -40C Waterproof grade is IP67
