STM6LY-250M R Adjustable Residual Current MCCB
STM6LY-250M/R adjustable residual-current MCCB for AC400V circuits, combining thermal-magnetic, short-circuit and earth-leakage protection with selectable settings.
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STM6LY-250M/R adjustable residual-current MCCB for AC400V circuits, combining thermal-magnetic, short-circuit and earth-leakage protection with selectable settings.
Overview
The STM6LY-250M R combines thermal-magnetic overload and short-circuit protection with selectable residual-current protection for AC400V circuits. Exact settings and pole arrangements are matched to the model.
Key Features
- Thermal-magnetic protection with residual-current protection
- Any four listed residual-current settings adjustable from 50mA to 1000mA
- 16A to 1250A across 125A to 1250A frames
- 2P / 3P / 4P configurations, frame dependent
STM6LY-250M/R Adjustable Residual-Current MCCB (250 Frame)
| Parameter | 250 |
|---|---|
| Frame size In (A) | 100A~250A |
| Number of poles | 3P, 4P |
| Rated insulation voltage Ui (V) | 1000V |
| Rated impulse withstand voltage Uimp (kV) | 8kV |
| Rated operational voltage Ue (V) AC | 400V |
| Rated residual operating current IΔn (mA) | 50mA, 100mA, 200mA, 300mA, 500mA, 800mA, 1000mA (any four settings adjustable) |
| Rated residual making and breaking capacity IΔm (kA) | 12.5kA |
| Breaking capacity code | C, S, M, H |
| Ics AC400V M (kA) | 25 |
| Ics AC400V H (kA) | 35 |
| Icu AC400V M (kA) | 35 |
| Icu AC400V H (kA) | 50 |
| Mechanical life (operations) | 7000 |
| Electrical life (operations) | 1000 |
| Dimensions 3P L*W*H*H(handle) (mm) | 165*105*68(88)*96(116) |
| Dimensions 4P L*W*H*H(handle) (mm) | 165*140*68(88)*96(116) |
Typical Applications
- Distribution boards
- AC400V circuits requiring residual-current protection
- Industrial and building installations
Frequently Asked Questions
What protection functions are combined in the STM6LY-250M R?
The unit combines thermal-magnetic overload and short-circuit protection with residual-current protection in one MCCB.
How is residual-current protection adjusted?
The family data lists selectable 50, 100, 200, 300, 500, 800 and 1000mA values in a four-step adjustable arrangement.
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