EMAS B100S21 Selector Switch 1NO (0-I) 60° Spring Return 22mm Control Unit
The EMAS B100S21 is a B Series plastic selector switch control unit designed for industrial automation and
electrical control panel applications. Featuring a 1NO contact configuration, a 0-I selector position,
and a 60° spring return mechanism, this 22mm selector switch provides reliable momentary control for machinery,
control circuits, and automation systems.
Manufactured by EMAS, the B100S21 uses durable non-flammable V0 PA6.6 contact block construction and is designed according to
industrial standards including IEC 60947-5-1, UL 508, and VDE 0660. It offers dependable switching performance with a compact
panel-mounted design suitable for demanding industrial environments.
Product Features
Brand: EMAS
Model: B100S21
Product Type: Selector Switch Control Unit
Series: B Series Plastic
Contact Configuration: 1NO (1 Normally Open)
Selector Positions: 0-I
Switching Angle: 60°
Operation: Spring Return
Mounting Diameter: 22mm
Protection Rating: IP50
Current Rating: 4A at 250V AC
Mechanical Life: Minimum 500,000 operations
Electrical Life: Minimum 100,000 operations
Applications
The EMAS B100S21 selector switch is suitable for industrial control panels, machinery automation, electrical cabinets,
motor control systems, and applications requiring a momentary selector input signal.
Why Choose EMAS B100S21?
Reliable spring return selector operation
Compact 22mm panel mounting format
Long mechanical and electrical service life
Durable flame-resistant contact block design
Suitable for industrial automation and machinery controls
Technical Specifications
Specification Details Manufacturer
EMAS
Part Number
B100S21
Product Series
B Series Plastic
Switch Type
Selector Switch
Contact Material
AgNi
Rated Current
4A (250V AC)
Usage Category
AC-15
Insulation Voltage
300V
Operating Temperature
-15°C to +80°C
Protection Degree
IP50
Mounting Size
Ø22.4 ±0.2mm
Cable Section
1.5-2.5mm²
Short Circuit Breaking Capacity
Ics 1kA
Standards
IEC 60947-5-1, TS EN 60947-5-1, UL 508, VDE 0660
Frequently Asked Questions
What is the EMAS B100S21?
The EMAS B100S21 is a 22mm B Series plastic selector switch control unit with a 1NO contact and 0-I spring return selector
mechanism.
Is the EMAS B100S21 a maintained selector switch?
No. The B100S21 features a spring return operation, meaning the selector returns to its original position after release.
What mounting size does the EMAS B100S21 require?
The EMAS B100S21 is designed for standard 22mm control panel mounting.
What is the contact configuration of the EMAS B100S21?
The EMAS B100S21 uses one normally open (1NO) contact block.
Specification Details Manufacturer
EMAS
Part Number
B100S21
Product Series
B Series Plastic
Switch Type
Selector Switch
Contact Material
AgNi
Rated Current
4A (250V AC)
Usage Category
AC-15
Insulation Voltage
300V
Operating Temperature
-15°C to +80°C
Protection Degree
IP50
Mounting Size
Ø22.4 ±0.2mm
Cable Section
1.5-2.5mm²
Short Circuit Breaking Capacity
Ics 1kA
Standards
IEC 60947-5-1, TS EN 60947-5-1, UL 508, VDE 0660
No documents available for this product.
Delivery
We offer fast UK delivery on all stocked items. Orders placed before 3pm Monday to Friday are eligible for next-day delivery.
Standard delivery: 2–3 working days
Next-day delivery: available on in-stock items when ordered before 3pm
Express options available — contact us for details
Returns
If you need to return an item, please contact our sales team within 30 days of receipt. Items must be returned unused in their original packaging.
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
Priority sourcing and supply support
Flexible payment terms for qualifying organisations
Support for engineering, maintenance, and operations
500 +
Stock lines ready to ship
1,000 +
Same day dispatches
3500 +
Customers supported
28
Trusted Manfacturers
● frequently asked questions
Common questions about our products and support
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
What product ranges do you supply
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...