Mk electric LOGIC PLUS DIMMER SWITCHES DATASHEET

TECHNICAL DATA SHEET

Logic Plus

Dimmer Switches

1:2

Logic Plus™ Dimmer Switches

PRODUCT RANGE

Standard Dimmer Switches

1 gang, 1 way, single
dimmer switch, 40-250W K1531 WHI

1 gang, 1 way, double
dimmer switch, 2 x 40-250W K1532 WHI

1 gang, 1 way, single
dimmer switch, 60-450W K1511 WHI

1 gang, 2 way, single
dimmer switch, 40-250W K1534 WHI

1 gang, 2 way, double
dimmer switch, 2 x 40-250W K1533 WHI

1 gang, 2 way, single
dimmer switch, 60-450W K1535 WHI

Intelligent Dimmer Switches

1 gang, single dimmer switch
40-300W (LV rating 40-240W/VA) K1521 WHI LV

1 gang, double dimmer switch
2 x 40-300W
(LV rating 2 x 40-240W/VA) K1522 WHI LV

1 gang, single dimmer switch
60-500W (LV rating 60-400W/VA) K1501 WHI LV

Description

MK Dimmer Switches fall into two
categories:

1) Standard Dimmer Switches

2) Intelligent Dimmer Switches
Logic Plus offers both categories of Dimmer
Switches

Standard Dimmer Switches

Dimmer Switches belonging to this category
employ simpler electronic circuitry and make
use of thermal switches to conform to the
very stringent requirements of the Standard
BS EN60669-2-1, for overload protection.
They are only suitable for use with normal
tungsten filament lamps with internal fuses,
conforming to BS 161 standard and do not
have any added features, e.g. soft start,
ability to control dimmable transformers for
low voltage, etc. Standard Dimmer

Switches are not suitable for use with
transformers for Low Voltage Lighting
or Fluorescent Loads, including Energy
Saving Lamps.

Intelligent Dimmer Switches

Dimmer Switches belonging to this category,
employ the latest, state of the art, micro­controller based electronic circuitry and use
current sensing to compute the load
conditions. These products show progressive
reaction to overload conditions, depending
on the extent of overload as shown in the
table below. List numbers belonging to this
category are identified by the suffix letters LV,
e.g. K1521 WHI LV. All MK Intelligent Dimmer
Switches employ one pole change over
switches to facilitate two way switching.

MK Intelligent Dimmer Switches are not
suitable for use with Fluorescent Loads,
including Energy Saving Lamps.

Overload reaction

Case Approximate load Power output to load when dimmer control is

on the dimmer as set to maximum
a percentage of its
maximum rating

1 Up to 125 Load will receive maximum power continuously.

2 >125 to 150 Output to load will be reduced to 50% of the maximum

after a delay of approximately 20 seconds after switch on.

3 >150 to 200 Output to load will be reduced to the minimum setting of

the dimmer after a delay of approximately 20 seconds after
switch on.

4 >200 Output will be disabled (load will be switched off) almost

instantaneously after switch on.

©2001 MK Electric Limited The Arnold Centre, Paycocke Road, Basildon, Essex SS14 3EA, United Kingdom Tel: [phone] Fax: [phone] email: [e-mail] www.mkelectric.co.uk Edition 07-01

TECHNICAL DATA SHEET

86 28

Logic Plus

Dimmer Switches

2:2

Dimensions (mm)

TECHNICAL SPECIFICATION

Electrical

Mains Supply Voltage:
230V a.c. (Nominal)

Mains Supply Voltage Range:
216V a.c. to 253V a.c.

Mains Supply Frequency:
50Hz ±3Hz

Type of Loads

Standard Dimmers:
Fused GLS Tungsten Filament lamps only to BS161,
rated at 230/240V

Low Voltage Dimmers:
Fused GLS Tungsten Filament lamps to BS161,
rated at 230/240V. Dimmable wire wound or
electronic Low Voltage Transformers of good quality.

Note: Transformer must be suitable for dimming
using phase delay (leading edge) and NOT only
phase cut (trailing edge) type of dimmers.

Warning: These dimmer switches are not suitable for
use with Fluorescent Lamps or Energy Saving Lamps.

Physical

Operating temperature:
0°C to +40°C)

IP rating:
IP4X

Max. installation altitude:
2000 metres

Standards and approvals

All Logic Plus dimmer switches comply with the EC
Low Voltage Directive: 73/23/EEC,
Electromagnetic Compatibility Directive 89/336/EEC

They also comply with BS EN 60669-2-1
and BS EN 55015

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19

16

60.3

Features

Intelligent Dimmer Switches

incorporate the following advanced
features

■ Suitable for dimming Low Voltage

Halogen lamps via good quality, fully
dimmable electronic or wire-wound
transformers.

■ Unidirectional current sensing.

While being used with wire-wound
transformers for low voltage lighting,
these dimmer switches continuously
monitor the drive conditions to the
transformers, which require essentially,
bi-directional a.c. supply at their input
terminals. If, due to some fault

Box types

Flush Surface

1 gang (excluding double dimmers) 861 ZIC (25mm) –

1 gang (for double dimmers) 866 ZIC (35mm) –

Intelligent Dimmer Switches

Rating Max No. of Transformers

1 gang single switches 40-300W (LV rating 40-240W/VA 4

1 gang double switches 40-300W (LV rating 2 x 40-240W/VA) 4 per dimmer

1 gang single 60-500W (LV rating 60-400W/VA) 5

One-way switching

Supply 230V a.c. - 50Hz

Two-way switching
(only one dimmer can be used)

Supply 230V a.c. - 50Hz

L

Load

N

2 way switch

Load

N

L

L1

L2

DIMMER

C

L1

L1
C
L2

L2

DIMMER

C

18

condition, the supply to the wire­wound transformer is detected to be
unidirectional, which could result in
over-heating and/or damaging the
transformer, the dimmer switches’
circuitry automatically stops supplying
the transformer after a few cycles of
detected unidirectional supply.

■ Soft Start, which gradually increases

the light output from the load over 1
to 3 seconds after switch on. The Soft
Start feature is also particularly
beneficial when used to dim Mains
Voltage Tungsten Halogen lamps which
have inherent very high inrush current
at switch on.

Wires must be connected to the correct Dimmer terminals.
DO NOT connect earth to Dimmer

©2001 MK Electric Limited The Arnold Centre, Paycocke Road, Basildon, Essex SS14 3EA, United Kingdom Tel: [phone] Fax: [phone] email: [e-mail] www.mkelectric.co.uk Edition 07-01