STM6RT Dual-Adjustable MCCB
STM6RT thermal-magnetic MCCB with dual-adjustable thermal (0.8–1.0 In) and magnetic (5–10 In) settings — listed frames from 125A to 1250A.
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STM6RT thermal-magnetic MCCB with dual-adjustable thermal (0.8–1.0 In) and magnetic (5–10 In) settings — listed frames from 125A to 1250A.
Overview
The STM6RT series offers independent thermal and magnetic adjustment for protection coordination across the listed 125A to 1250A frames.
Key Features
- Thermal adjustable 0.8–1.0 In, magnetic adjustable 5–10 In
- 16A to 1250A rated-current range
- AC400V, 3P and 4P configurations
- 125 / 160 / 250 / 400 / 630 / 800 / 1250A frames
STM6RT Thermal-Magnetic Dual-Adjustable MCCB
| Parameter | 125 | 160 | 250 | 400 | 630 | 800 | 1250 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | S | M | H | C | S | M | H | C | S | M | H | M | H | M | H | M | H | M | H | |
| Frame size In (A) | 16A~125A | 25A~160A | 100A~250A | 250A~400A | 400A~630A | 500A~800A | 1000A~1250A | |||||||||||||
| 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 | |||||||||||||||||||
| Breaking capacity code | C | S | M | H | C | S | M | H | C | S | M | H | M | H | M | H | M | H | M | H |
| Rated service short-circuit breaking capacity Ics (kA) AC400V | 5 | 10 | 18 | 50 | 5 | 10 | 10 | 50 | 5 | 8 | 10 | 50 | 50 | 50 | 50 | 50 | 50 | 65 | 50 | 65 |
| Rated ultimate short-circuit breaking capacity Icu (kA) AC400V | 10 | 20 | 36 | 50 | 8 | 20 | 20 | 50 | 8 | 15 | 20 | 50 | 50 | 50 | 50 | 50 | 65 | 85 | 65 | 85 |
| Mechanical life (operations) | 8500 | 8500 | 7000 | 4000 | 4000 | 2500 | 2500 | |||||||||||||
| Electrical life (operations) | 1500 | 1500 | 1000 | 1000 | 1000 | 500 | 500 | |||||||||||||
| Dimensions 3P L*W*H*H(handle) (mm) | 130*75*68*94.5 | 155*90*68(82)*94(108) | 165*105*68(88)*96(116) | 257*140*103*152 | 257*140*103*152 | 275.5*210*103*152 | 275.5*210*103*152 | |||||||||||||
| Dimensions 4P L*W*H*H(handle) (mm) | 130*100*68*94.5 | 155*120*68(82)*94(108) | 165*140*68(88)*96(116) | 257*184*103*152 | 257*184*103*152 | 275.5*280*103*152 | 275.5*280*103*152 | |||||||||||||
Typical Applications
- Generators
- Large motors
- Main distribution feeders
- Industrial plants
Frequently Asked Questions
What does dual-adjustable mean?
Both the thermal (overload) setting and the magnetic (short-circuit) setting can be adjusted independently — useful for generator and motor applications where fixed settings nuisance-trip.
Which frame sizes are listed?
Seven frames are listed from 125A to 1250A. Confirm the exact rated current and RT or RT-A configuration before ordering.
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