Is this a trailing edge dimmer switch please, for dimmable LEDs?

The info states: "COMPATIBLE WITH LED ...... LAMPS: Thanks to the intelligent trailing edge dimmers having a lower minimum load than leading edge dimmers." This implies to me that it is a trailing edge dimmer. However, the top left of the same page states that it is a leading edge dimmer, as does the 'specifications' pdf. This also states that the dimmer unit will emit a faint buzz. Clicking on the link to the 'user manual'' pdf takes me to Swordfish Paper Trimmers.

Can you still uses this as a 1 gang 1 way switch for bedroom

I would suggest using a different switch BG NBS12 which is a 1 gang 2 way but you can use it as a 1 gang 1 way switch too.

can you use these switches for 1 way as well as 2 way

I have just wired this four gang two way switch for one way operation, the wiring advice states live to common terminal and switched live to L1 terminal however this causes the lights to come on with the switches in the off position and be off in the on position. A continuity test showed that terminal L2 was acting as L! and L1 was acting as L2, so I used L2 for switched live and all is well in the kitchen! Hope this helps.

What depth back box do I need for this?

It says 35mm on the technical specs.

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BG Electrical Single Dimmer Intelligent Light Switch, Brushed Steel, 2-Way 400 W NBS81P-01

Product ID: 48836620

Details

Brand
British
Connector type
Screws
Contact type
Normally Open
Current rating
1 Amps
Item dimensions L x W x H
8.6 x 4.5 x
Material
Alloy Steel

⚡400W max load

🔄2-way switching

🛡️25-year warranty

AED 131

Duties & taxes included

In stock

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Description

💡 Dim Smarter, Live Brighter — The Switch That Works as Hard as You Do

OVERLOAD SAFETY FEATURE - Automatically dims or shuts off to prevent damage if overloaded—peace of mind meets smart tech.
EFFORTLESS 2 WAY CONTROL - Control your lighting from two locations with easy installation and clearly marked terminals.
SLEEK BRUSHED STEEL DESIGN - Elevate your space with a slim, raised profile and softly rounded edges for a modern, professional look.
SMART TRAILING EDGE DIMMING - Enjoy smooth, buzz-free dimming compatible with LEDs, CFLs, and traditional bulbs—perfect for mood and energy control.
BUILT IN MOISTURE PROTECTION - Integrated gasket guards metal edges from tarnish, ideal for fresh plaster and long-lasting style.

The BG Electrical Single Dimmer Intelligent Light Switch combines a stylish brushed steel finish with advanced trailing-edge dimming technology, supporting up to 400W and 2-way switching. Designed for seamless compatibility with LED, CFL, and traditional bulbs, it features integrated moisture protection and overload safety. Backed by a 25-year warranty, this switch offers professional-grade durability and effortless control for modern smart homes and offices.

Specifications

ASIN	B007CVCW2E
Actuator Type	Rotary
Best Sellers Rank	5,135 in DIY & Tools ( See Top 100 in DIY & Tools ) 44 in Switches & Dimmers
Brand	British General
Circuit Type	2-way
Colour	Brushed Steel
Compatible Devices	LED lamps, tungsten lamps, low voltage transformers, mains GU10 halogen
Connectivity Protocol	Wi-Fi
Connector Type	Screws
Contact Material	Metal
Contact Type	Normally Open
Control Method	Push Button
Control Type	Dimming
Controller Type	Push Button
Country Of Origin	China
Current Rating	1 Amps
Customer Reviews	4.2 4.2 out of 5 stars (2,670)
EU Spare Part Availability Duration	25 Years
Global Trade Identification Number	05050765019118
Included Components	Single Dimmer Switch
International Protection Rating	IP00
Item Dimensions	8.6 x 4.5 x 8.6 centimetres
Item Type Name	BG Electrical NBS81 400W Single 2-Way Metal Brushed Steel Push On/ Off Dimmer Switch
Item Weight	0.1 Kilograms
Lower Temperature Rating	10 Degrees Celsius
Manufacturer	BG Electrical
Manufacturer Part Number	NBS81P-01
Material	Alloy Steel, Metal, Plastic
Model Number	NBS81P-01
Mounting Type	Wall Mount
Number of Items	1
Number of Positions	1
Operating Voltage	250 Volts
Operation Mode	ON-OFF
Specification Met	BS EN 60991-2
Switch Type	Dimmer Switch
Terminal	Screw
Unit Count	1.0 count
Upper Temperature Rating	100 Degrees Fahrenheit
Wattage	400 watts

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