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				MK Electric (a brand by Honeywell), all of which comply with the BS 1363 standard. 
They are all high-quality plugs but are designed for different purposes.Here is a breakdown of the differences between them:
1. MK 650
Type: The Standard Plug Top
Description: This is the most common, standard-duty 13A plug top used for everyday household appliances like lamps, computers, fans, and kitchen appliances.
Material: It is typically made from Urea, a hard, thermosetting plastic that is scratch-resistant.Key Feature: Standard, no-frills, reliable plug.
Common Suffix: WHI for White.
2. MK 654
Type: The Standard Plug Top with Neon Indicator
Description: .
This plug is physically identical to the MK 646 in shape and application, but with one key addition.
Material: Also made from Urea.
Key Feature: 
It includes a red neon indicator (a small light) that illuminates when the plug is receiving power. 
This is useful for:Seeing if a socket is switched on at a glance.Identifying if an appliance on an extension lead has power.
Common Suffix: WHI for White.
3. MK 646
Type: The "Toughplug" (Heavy Duty)
Description: 
This is a heavy-duty, impact-resistant plug. 
It is designed for use in more demanding environments like workshops, garages, or with industrial equipment or power tools.
Material: It is made from a resilient, shatter-proof material (often PVC or rubber) rather than the harder plastic of the 646 and 654.Key Feature: High durability and impact resistance.
It's designed to withstand being dropped or knocked around.
Common Suffix: BLK for Black.
Summary of DifferencesModelCommon NameKey Feature
Material
Typical Use
MK 650 Standard Plug
Standard, no indicatorUrea (Hard Plastic)
Everyday home/office appliances
MK 654 Indicator Plug
Neon Power LightUrea (Hard Plastic)
Appliances where a power-on visible check is useful
MK 646
Toughplug"Heavy-Duty, Impact-ResistantPVC / Rubber
Workshops, garages, power tools, industrial use
Common Features
All three models are:
Rated for 13 Amps.Built to the BS 1363 standard.
Come fitted with a 13A fuse (which can be swapped for a 3A or 5A fuse if the appliance requires it).
Known for their high quality, safety, and reliability.