Siemens 5SY42208

Image may be a representation.
See specs for product details.
Circuit Breaker; Supplementary; 2-P; 20A; D Curve; DIN Mnt; UL1077
Manufacturer #: 5SY42208
Allied Stock #: 70372340


Datasheet Datasheet

Pricing (USD) & Availability
Standard Pricing
$90.98 (Each)
1 $90.98
3 $85.52

2 can ship immediately.

Request Lead Time

Minimum Quantity: 1

Multiples Of: 1


Actuator Type : Toggle
Characteristic : D Curve
Current Rating : 20 A
Mounting Type : DIN Rail
Number of Poles : 2 Pole
Overload : Thermal/Magnetic
Primary Type : Miniature Circuit Breaker
Series : 5SY Series
Standards : UL1077 Recognized
Termination : Screws
Type : UL1077
UPC Code : 754554876030
Voltage Rating : 400 VAC


SIEMENS 5SY(4, 5, 6) Series Miniature Circuit Breakers – UL1077 Supplementary Protector Miniature Circuit Breakers:

Siemens' UL 1077 Supplementary Protectors are designed to provide additional protection along with a branch circuit protection device. Since our Supplementary protectors are made to trip faster than a standard UL 489 Circuit Breaker they are able to provide additional protection for more sensitive devices inside the panel. Supplementary protectors can used in a number of industrial applications such as to provide selectivity for multiple motor control circuits on the secondary side of a control transformer or power supply by allowing the user to quickly find the problem circuit should a fault occur with out having to shut down all of the other control circuits. Supplementary protectors may also be used as a local disconnecting means inside the panel when a branch circuit protection device is already present.


  • High rated breaking capacity of up to 14,000 A
  • Identical terminals at both sides for an optional infeed from the top or the bottom
  • No tool required for mounting or dismounting
  • Separate switch position indication

    Supplementary protectors are equipped with a delayed overload/time-dependent thermal release (thermal bimetal) for low overcurrent's and with an instantaneous electromagnetic release for high overload and short-circuit currents. The thermal trip point on all versions is 1.13 to 1.45 times the supplementary protector rating.

    Tripping characteristic A, -5:
    To protect very sensitive circuits such as semiconductors. Magnetic trip point - 2 to 3 times supplementary protector rating.

    Tripping characteristic B, -6:
    For European residential circuit protection. Also for protection of computers and electronic equipment. Magnetic trip point
    - 3 to 5 times supplementary protector rating.

    Tripping characteristic C, -7:
    For general device protection in control circuits and all other supplementary circuit protection systems. Magnetic trip point
    - 5 to10 times supplementary protector rating.

    Tripping characteristic D, -8:
    For protection of high inrush loads. Magnetic trip point - 10 to 20 times supplementary protector rating.

  • Product Added to Cart
    Circuit Breaker; Supplementary; 2-P; 20A; D Curve; DIN Mnt; UL1077
    Allied Stock #: 70372340
    Mfr's Part #: 5SY42208
    $90.980 Each
    Quantity added: