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Siemens 5SY7320-8 Miniature Circuit Breaker: 3-Pole, 20A, D-Curve

Siemens 5SY7320-8 3-Pole Miniature Circuit Breaker, 20A

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ManufacturerSiemens

Part number5SY7320-8

Voltage 400V

Breaking Capacity 15kA

Poles 3

Curve Type D

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3-pole protection 15kA interrupting capacity Type D tripping characteristic 400V rated voltage 20A current handling

Product description

The Siemens 5SY7320-8 is a 3-pole miniature circuit breaker providing enhanced protection for three-phase systems. It boasts a 400V operational voltage and a robust 15kA breaking capacity, ensuring safety under fault conditions. This breaker features a Type D tripping characteristic, suitable for applications with high starting currents, and is rated for 20A.

This 3-pole breaker is ideal for protecting three-phase motors, transformers, and other equipment in industrial settings where phase balancing and comprehensive fault protection are critical. It ensures reliable operation and safety across multiple conductors.

As a veteran-owned distributor, Stanlo Automation is dedicated to supplying quality surplus industrial automation parts. We offer competitive pricing and a commitment to customer satisfaction, ensuring you get the parts you need quickly and reliably.

Technical specifications

Voltage	400V
Breaking Capacity	15kA
Poles	3
Curve Type	D
Current Rating	20A
Width	70mm

Common applications

Three-phase motor protection

Industrial machinery

Power distribution panels

High inrush current loads

Manufacturing equipment

Compatible systems

Standard DIN rail mounting systems

Also known as

Siemens 5SY7320-8 MCB Siemens 20A 3-pole breaker 5SY7 series breaker

Replaces / compatible with

This 3-pole Type D circuit breaker can replace other Siemens 3-pole miniature circuit breakers with similar specifications. Consult the manufacturer's data for precise compatibility.

Technical note

Expert tip

For three-phase motor applications, ensure all three poles are adequately protected and correctly wired to prevent single-phasing issues.

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Frequently asked questions

Why is a Type D curve important for three-phase motor protection with the Siemens 5SY7320-8?

A Type D curve on the Siemens 5SY7320-8 is crucial for three-phase motor protection because motors draw significantly higher current during startup (inrush current). The Type D characteristic allows for these high transient currents without causing nuisance tripping, while still providing rapid protection against dangerous short circuits.