Home › Manufacturers › Siemens › 5SM2121-6

Siemens

Siemens 5SM2121-6 RC Unit for 5SY Series — 2-Pole, 16A, 10mA

Siemens 5SM2121-6 RC Unit for 5SY Series

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

In Stock — Ready to Ship

ManufacturerSiemens

Part number5SM2121-6

Type RC Unit

For Use With Siemens 5SY Series MCBs

Poles 2

Tripping Characteristic Type A

Get a price for 5SM2121-6

Response within 1 business hour

🛡

12-month warranty

All units tested

⚡

Same-day dispatch

Order by 2pm CST

🌐

Worldwide delivery

US, EU, Asia, Middle East

🎖

Veteran-owned

CAGE: 9NK75

Residual Current Detection Type A Sensitivity 10mA Sensitivity 2-Pole Configuration For 5SY Series MCBs Compact Design

Product description

The Siemens 5SM2121-6 is a residual current (RC) unit designed for use with Siemens 5SY miniature circuit breakers. This 2-pole unit provides enhanced protection against electric shock and fire hazards by detecting earth leakage currents. It features Type A sensitivity, a rated current of 16A, a residual current of 10mA, and operates at 230V AC, offering sensitive protection for specific circuits.

This RC unit is ideal for applications requiring higher sensitivity to earth leakage, such as specialized industrial equipment, medical facilities, or areas with increased risk. It is typically used in conjunction with a compatible 5SY miniature circuit breaker to form a residual current circuit breaker with overcurrent protection (RCBO).

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 5SM2121-6. We ensure you receive quality components and reliable service to maintain the safety and efficiency of your electrical systems.

Technical specifications

Type	RC Unit
For Use With	Siemens 5SY Series MCBs
Poles	2
Tripping Characteristic	Type A
Rated Current (In)	16A
Residual Current (IΔn)	10mA
Rated Voltage (Un)	230V AC
Manufacturer	Siemens

Common applications

High-Sensitivity Protection

Specialized Industrial Equipment

Medical Facilities

Sensitive Electronic Circuits

Laboratories

Enhanced Safety Applications

Compatible systems

Siemens 5SY Miniature Circuit Breakers

Also known as

Siemens 5SM2121-6 RCD Unit 2-Pole 16A 10mA Type A RC Module Siemens 5SY RC Module

Replaces / compatible with

Designed to be combined with Siemens 5SY miniature circuit breakers to create a residual current device (RCD) or RCBO. Check compatibility with specific 5SY models.

Technical note

Expert tip

This RC unit requires a separate overcurrent protection device (like a 5SY MCB) to form a complete RCBO; it does not provide overcurrent protection on its own.

What happens next?

Email confirmation

Immediate receipt acknowledgment sent to you

Account manager assigned

Confirms your part's spec and condition

Your quote delivered

Tailored to your specific requirements

Frequently asked questions

What is the primary function of the Siemens 5SM2121-6 RC unit?

The primary function of the Siemens 5SM2121-6 RC unit is to detect residual (earth leakage) currents and, when combined with a compatible 5SY miniature circuit breaker, to interrupt the circuit. Its 10mA sensitivity provides a higher level of protection against electric shock for particularly sensitive applications.