Contact Blocks & Light Blocks

Contact Blocks
A contact block is an electrical circuit connector that is used to turn on (make) or turn off (break) an electrical circuit. Contact blocks are commonly found connected to switches, relays and circuit breakers, once these devices are active the contact block allows current to flow and complete a circuit.
Types of Contact Block
Contact blocks are usually designed as an accessory to fit a specific device, therefore matching the correct contact block and device are essential. The contact blocks are available with a wide range of contact configurations that allow the main device to change a circuit in many different ways. Typical contact configurations available are:
• 1NO (One normally open contact)
• 1NC (One normally closed contact)
• 1NO/1NC (One normally open and one normally closed)
• 2NO (Two normally open contact)
• 2NC (Two normally closed contact)
• 2NO/2NC (Two normally open and two normally closed)

Light Blocks
Push button light blocks are an addon block that mount to the rear of a push button switch alongside the contact blocks to act as an indicator light. The light blocks are turned on when the push button is pressed and illuminate through the button head.
Types of Light Block
Light blocks are available in two types:
• LED - These light blocks feature a fixed bright LED that is designed to last the lifetime of the push button. LED light blocks are available in a variety of colours to match the button colour.
• Incandescent - These light blocks feature a changeable incandescent bulb. The bulbs produce a white light that shines through the button head to produce the required colour.

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Description Price Series Block Type Contact Configuration Illumination Colour Voltage Rating Illumination Type Terminal Type Body/Fixing Collar Included Current Rating LED Included For Use With Accessory Type
RS Stock No. 610-2950
Mfr. Part No.ZBVM4
MYR121.93
Each
units
Harmony XB Light Block - Red 230 V LED Screw No - Yes - -
RS Stock No. 609-3165
Mfr. Part No.ZB5AZ105
MYR43.02
Each
units
Harmony XB5 Contact Block 1NO 1NC - - - Screw Yes 10 A - - -
RS Stock No. 331-0164
Mfr. Part No.ZB4BZ102
MYR28.97
Each
units
Harmony XB4 Contact Block 1NC - 600 V - Screw Yes - - - -
RS Stock No. 610-2837
Mfr. Part No.ZBVB4
MYR54.79
Each
units
Harmony XB Light Block - Red 24 V LED Screw No - - - -
RS Stock No. 610-2821
Mfr. Part No.ZBVB3
MYR54.25
Each
units
Harmony XB Light Block - Green 24 V LED Screw No - - - -
RS Stock No. 610-2843
Mfr. Part No.ZBVB5
MYR54.79
Each
units
Harmony XB Light Block - Yellow 24 V LED Screw No - - - -
RS Stock No. 399-3630
Mfr. Part No.M22-LED-W
BrandEaton
MYR47.04
Each
units
RMQ Titan Light Block - White 24 V LED Screw No 15 mA Yes - -
RS Stock No. 331-0574
Mfr. Part No.ZENL1111
MYR48.13
Each
units
Harmony XAL Contact Block 1NO - - - Screw No 10 A - - -
RS Stock No. 609-3109
Mfr. Part No.ZB5AV5
MYR183.81
Each
units
Harmony XB5 Light Block - - 400 V ac - Screw Yes - - - -
RS Stock No. 330-9833
Mfr. Part No.ZB4BW0B35
MYR92.90
Each
units
Harmony XB4 Contact & Light Block 1NO 1NC Green 24 V ac/dc LED Screw Yes 10 A Yes - -
RS Stock No. 609-3159
Mfr. Part No.ZB5AZ104
MYR48.52
Each
units
Harmony XB5 Contact Block 2NC - - - Screw Yes 10 A - - -
RS Stock No. 331-0192
Mfr. Part No.ZB4BZ105
MYR35.10
Each
units
Harmony XB4 Contact Block 1NO 1NC - - - Screw Yes 10 A - - -
RS Stock No. 399-3674
Mfr. Part No.M22-LED-B
BrandEaton
MYR36.14
Each
units
M22 Light Block - Blue 12 → 30 V ac/dc LED Screw No 15 mA Yes - -
RS Stock No. 411-1362
Mfr. Part No.3SB3400-0C
BrandSiemens
MYR20.32
Each
units
Siemens 3SB3 Contact Block 1NC - - - Screw No 10 A No - -
RS Stock No. 610-2938
Mfr. Part No.ZBVM1
MYR133.40
Each
units
Harmony XB Light Block - White 230 V LED Screw No - Yes - -
RS Stock No. 260-312
Mfr. Part No.33EAGL
BrandBACO
MYR57.18
Each
units
BACO Light Block - Green 24 V LED Screw No - Yes - -
RS Stock No. 746-8412
Mfr. Part No.ZB4BW055
MYR205.09
Each
units
Harmony XB4 Contact & Light Block 1NO 1NC - 400 V ac - Screw Yes 10 A No - -
RS Stock No. 330-9726
Mfr. Part No.ZB4BVM5
MYR92.57
Each
units
Harmony XB4 Light Block - Yellow 230 → 240 V LED Screw Yes - Yes - -
RS Stock No. 331-0580
Mfr. Part No.ZENL1121
MYR33.04
Each
units
Harmony XAL Contact Block 1NC - - - Screw No - - - -
RS Stock No. 411-1340
Mfr. Part No.3SB3400-0B
BrandSiemens
MYR20.32
Each
units
Siemens 3SB3 Contact Block 1NO - - - Screw No 10 A - - -
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