| 摘要 |
A heater is provided to directly check operation of the heater with a naked eye without a separate disconnection sensing device. A heater(100) includes a body unit(104), a heating unit(106), and an operation display lamp(110). The body unit is coupled with external power. The heating unit has a plurality of heating elements to generate heat by the external power. The operation display lamp is coupled with the heating unit to display whether the heating unit is normally operated or not. The external power is three-phase AC power. The operation display lamp is coupled between R and S phases. |
