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An important safety function of these devices is to monitor of the leakage current of the entire system from Power modules against earth.A defective system can become dangerous for people or cause fires. Before it comes so far, Power modules must be disconnected from the grid. The leakage current contains DC and AC components. Therefore an AC/DC-sensitive monitoring unit necessary. The heart of the safety device is the MT RCMU®, whose value is evaluated by the control system of Power modules.
Generally protection devices with AC/DC-sensitive differential current sensors can be used everywhere, where flator pulsating DC can develop, whose amount is permanently greater than zero. Instruction of installation in a Pollution Degree 2 environment is available on the table below(or
equivalent statement).
Characteristics
Applications
Application Circuit
At Ta=25℃,Vc=5V, RH＜70% ,unless otherwise noted
| Parameter | Symbol | Value | Unit |
| Voltage for AC/rms insulation test, 50 Hz, 1 min | Ud | 3 | kV |
| Impulse withstand voltage @1.2/20 μs | Uw | 7 | kV |
| Lightning surge current @8/20us | ILS | 5 | kA |
| ystem working voltage (rms) | Vs | 300 | V |
| Comparative Tracking Index(Group 2 @UL) | CTI | 250-400 | V |
| Clearance | DCI | 4.4 | mm |
| Creepage distance | DCP | 4.5 | mm |
| Application example | - | 600 , CAT III, PD2 | V |