Applications and functions
● Incoming and outgoing function in distribution systems
● Switching and protection devices for motors, transformers and capacitors
● Disconnect or units with features for stopping and switching off in emergency mechanisms and terminal covers in conjunction with likeable rotary operating
● Available in the following versions
● Power protection: the overload and short-circuit releases are designed for the protection of cables, leads and non-motor loads
● Motor protection: the overload and short-circuit releases are designed for optimized protection and direct-on-line starting of induction squirrel-cage motors. The circuit breakers for motor protection are susceptible to phase failure and feature an adjustable trip class
Instruction of type code
● There is no frame E and F for motor protection.
● Only M type (medium breaking capacity type) has 4 poles:
a. 4A: N-pole fixed without over-current release unit, it has been connected all along, and does not act with other three poles to turn on or off.
b. 4B: N-pole fixed without over-current release unit, it acts with other three poles.
c. 4C: N-pole fixed with over-current release unit, it acts with other three poles.
d. 4D: N-pole fixed with over-current release unit, it has been connected all along, and does not act with other three poles to turn on or off.
Instruction of external structure
Technical Specifications
Selection and ordering data
Selection and ordering data
Selection and ordering data
Accessories
Accessories
Tripping Characteristic
For power distribution
| No. | Test current | I/In | Conventional time | Start status |
| 1 | Conventional non-trip current | 1.05 | 2h (In > 63 A), 1h (In ≤ 63 A) | Cold status |
| 2 | Conventional trip current | 1.3 | 2h (In > 63 A), 1h (In ≤ 63 A) | Right after test No.1 |
For motor protection
| No. | Operational current | Conventional time | Start status | Remark |
| 1 | 1.0 In | 2 h | Cold status | - |
| 2 | 1.2 In | ≤ 2 h | Right after test No.1 | - |
| 3 | 1.5 In | ≤ 4 min ≤ 8 min | Cold status Cold status | 10 ≤ In ≤ 225 225 ≤ In ≤ 630 |
| 4 | 7.2 In | 4 s ≤ T ≤ 0 s 6 s ≤ T≤ 20 s | Cold status Cold status | 10 ≤ In ≤ 225 225 ≤ In ≤ 635 |
Outline and installation dimensions
3SM8N-63, 100, 225 (front connection)
Outline and installation dimensions
3SM8N-400, 630, 800 (front connection)
Outline and installation dimensions
3SM8N-63, 100, 225 (Rear connection)
Outline and installation dimensions
Temperature performance curve
English
