Hager ASD425U 25A D Curve 30mA RCBO
For installations where a standard C characteristic may not suit the expected inrush, consider the Hager ASD425U 25A D Curve 30mA RCBO. It pairs the D characteristic with 30mA Type A residual-current protection and a switched-neutral 3P+N design.
Designed for Higher Starting Currents
D-curve protection is generally considered for equipment with high starting or magnetising currents; the instantaneous magnetic operating band is typically 10–20 × In. At 25A this corresponds to approximately 250–500A for the magnetic band, not a permissible continuous load. Confirm the board arrangement and protective-device schedule before substituting this product for another curve or sensitivity.
Key Product Details
This is a D-curve product; it should not be used as a C-curve replacement without checking fault-current and disconnection calculations. A 30mA residual-current threshold may be used for additional protection where the circuit design and regulations require it.
Technical Specifications – Hager ASD425U 25A D Curve 30mA RCBO
| Manufacturer | Hager |
|---|---|
| Part number | ASD425U |
| Device | Electronic three-phase RCBO with switched neutral |
| Poles | 3P+N; 3 overcurrent-protected phases |
| Rated current | 25A |
| Trip characteristic | D curve |
| Residual-current sensitivity | 30mA |
| Residual-current class | Type A |
| Rated breaking capacity | 10kA |
| Module width | 3 modules |
| Mounting | DIN rail; compatible Hager Invicta distribution arrangement (verify board model) |
Understanding B, C and D Trip Curves
B curve: typically 3–5 times rated current for instantaneous magnetic tripping, used for suitable low-inrush circuits. C curve: typically 5–10 times rated current, commonly specified for moderate inrush. D curve: typically 10–20 times rated current, considered for high-inrush loads such as some motors or transformers. Selected model: D curve. These bands describe magnetic tripping, not permissible continuous loading; the installed fault level and disconnection requirements must be verified.
The specific three-phase Hager range in this listing contains C- and D-curve models; no B-curve SKUs are included here.
Related Hager Three-Phase RCBOs
Compare ASD432U (32A, 30mA) or ASX440U (C curve, 30mA) for a different rating or sensitivity.
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Install and test in accordance with the Hager instructions and applicable wiring regulations. Verify the product-specific datasheet and board compatibility before ordering.
