Hager ASX440U 40A C Curve 30mA RCBO
Combining 30mA residual-current sensitivity and C-curve circuit protection, the Hager ASX440U 40A C Curve 30mA RCBO is a compact choice for suitably specified three-phase distribution. Three overcurrent-protected phases are paired with a switched neutral.
C-Curve Operation and 30mA Protection
With a 40A rating and 30mA sensitivity, this version may suit appropriate commercial three-phase final circuits. C-curve magnetic operation is typically within 5–10 × In, or approximately 200–400A at this rating. A 30mA residual-current threshold may be used for additional protection where the circuit design and regulations require it.
Planning the Installation
Check that upstream protective-device coordination and required disconnection times can be achieved in the finished installation. This is a C-curve product; substituting D curve changes the instantaneous-trip band and requires design verification.
Technical Specifications – Hager ASX440U 40A C Curve 30mA RCBO
| Manufacturer | Hager |
|---|---|
| Part number | ASX440U |
| Device | Electronic three-phase RCBO with switched neutral |
| Poles | 3P+N; 3 overcurrent-protected phases |
| Rated current | 40A |
| Trip characteristic | C 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: C 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 ASX450U (50A, 30mA) or ASY432U (C curve, 100mA) for a different rating or sensitivity.
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Explore the Hager 3 phase RCBO range, Hager three-phase distribution boards and Hager shop.
Install and test in accordance with the Hager instructions and applicable wiring regulations. Verify the product-specific datasheet and board compatibility before ordering.
