5ST3666-0HG Siemens Connecting Terminal Original Brand New


  • 5ST3666-0HG
  • Alternate Mfr Part Number:5ST3666-0HG
  • For Use With:5SJ4 Series
  • Primary Type:External Accessories
  • Series:5ST Series
  • Standards:UL 489, 480Y/277V
  • Type:Terminal Covers/Seals
  • UPC Code:754554961422

Available on backorder

Siemens Connecting Terminal – 5ST3666-0HG

MCBs from the Siemens SENTRON portfolio meet the enhanced requirements of automated buildings and industrial power supply systems, e.g. in the automotive and semiconductor industry or in data centers. Compared to residential and functional buildings, these are usually more extensive and complex in terms of both network topology and operation. Electricity and production downtimes must be deliberately prevented in these cases using coordinated device combinations if economic losses are to be avoided. Our MCBs protect wires and cables in cases of short circuit and overloads, and also enable backup protection for switching devices and also semiconductor protection. They are therefore a fundamental component in end-to-end protection concepts for industry and infrastructure.

The right combination

The main purpose of Siemens miniature circuit breakers is to permanently monitor and secure cables and wires in electrical systems. They also help protect humans against electric shocks when used in combination with RCCBs or as combined RCBO. Siemens Breaker combining the 5SY MCB with the 5SM6 arc-fault detection unit (AFDD) further expands the range of functions. An overview of all the combinations is provided below.

Strengths of the Siemens MCBs in the SENTRON portfolio – your benefits

  • Convenient to install and connect
  • Uniform additional components
  • Consistent design
  • Ergonomically formed devices


Siemens 5ST3666-0HG, Connecting terminal, CONNECTION TERMINAL Miniature Circuit Breaker, 35 mm2 according to UL 489, 480Y/277V for LS 5SJ4…-.HG Infeed LS


DataSheet in PDF

Weight 0.036 kg
Dimensions 73.00 × 141.00 × 46.00 mm


product brand name


product designation

Connecting terminal

design of the product

35 mm², acc. to UL 489, 480Y/277 V for MCBs 5SJ4…-.HG infeed MCB

operating voltage / at AC / rated value

1 000 V

operational current / at AC / rated value

160 A


connection terminal

tightening torque

● minimum

4 N·m

● maximum

4 N·m

type of connectable conductor cross-sections / for copper conductor / stranded

2.5 – 35 mm²


74.7 mm


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