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3SM8N, MCCBs with thermal magnetic trip units

Independent power supply with build-in power source,directly draws power from the incoming end to avoid the risk of protection function failure caused by external power supply failure.

● Overload protection
● Short circuit protection
● Isolation
● Controlling
● Used in residential building, non-residential building, industry, energy and infrastructure
Availability:

Overview

3SM8N.1


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

3SM8N.2


●   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

3SM8N.3


Technical Specifications

3SM8N.4


Selection and ordering data

3SM8N.5


Selection and ordering data

3SM8N.6


Selection and ordering data

3SM8N.7


Accessories

3SM8N.8


Accessories

3SM8N.9


3SM8N.10

3SM8N.11


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



3SM8N.12


Outline and installation dimensions

3SM8N-63, 100, 225 (front connection)

3SM8N.13


Outline and installation dimensions

3SM8N-400, 630, 800 (front connection)

3SM8N.14


Outline and installation dimensions

3SM8N-63, 100, 225 (Rear connection)

3SM8N.15


Outline and installation dimensions

3SM8N.16


Temperature performance curve

3SM8N.17


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