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Grey DIN-rail circuit breaker with black toggle switch and screw terminals

SIEMENS

SIEMENS 5SY41208 Circuit Breaker 20A 1 Pole 230/400V AC 10kA

SKU CH-9S02-70JYS

DIN-rail thermal-magnetic breaker rated 20 A at 230/400 V AC with 10 kA interrupting capacity

  • Brand nameSIEMENS
  • Reliable overload protection for industrial circuits with 10kA breaking capacity
  • Handles 20A loads on 230/400V AC single-phase systems
  • Thermal-magnetic trip mechanism responds to both short circuits and sustained overloads
  • Compact DIN-rail design fits standard panels at 3.54 in long and .69 in wide
  • Accepts wire from 14 AWG to 4 AWG with screw-clamp terminals

Industrial 20 A DIN-rail breaker

The SIEMENS 5SY41208 is a single-pole supplementary protector rated 20 A at 230/400 V AC with a 10 kA interrupting capacity. It uses a thermal-magnetic trip curve D and mounts on standard DIN rail for industrial control panels.

Check voltage, wire gauge and rail space

Verify the supply is 230/400 V AC single-phase and that conductors fall between 14 AWG and 4 AWG for the screw-clamp terminals. Confirm the panel provides 3.54 in length, 0.69 in width and 3.01 in depth per pole on the DIN rail.

Screw-clamp terminals on DIN rail

The toggle actuator gives clear on/off indication while the screw-clamp connections accept solid or stranded wire without ferrules. DIN-rail mounting allows quick side-by-side installation and easy replacement in crowded enclosures.

How it compares

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Price $39.99
Typical for this category: the median of 677 items is $33.99.

Specifications

Product
Brand nameSIEMENS

Questions about this item

What comes in the box with the 5SY41208 breaker and what must be purchased separately?

The unit itself is supplied. DIN rail, mounting screws and wiring between 14 AWG and 4 AWG are not included and must be sourced separately.

Which 5SY4 series variant should I choose for a 20 A industrial circuit?

Select the 20 A, 1-pole, Curve D version rated 230/400 V AC with a 10 kA breaking capacity; it matches the 5SY41208 specifications exactly.

What does the 10 kA rating mean when the breaker is installed on a 230/400 V AC panel?

It indicates the device can safely interrupt fault currents up to 10 000 amps at 230/400 V AC without damage.

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