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 Block Type Contact Configuration Series Illumination Colour Voltage Rating Illumination Type Terminal Type Body/Fixing Collar Included Current Rating LED Included
RS Stock No. 331-0473
Mfr. Part No.ZBE101
£3.81
Each
Units
Contact Block 1NO Harmony XB - - - Screw No 10 A → 600 V ac No
RS Stock No. 331-0489
Mfr. Part No.ZBE102
£3.81
Each
Units
Contact Block 1NC Harmony XB - 600 V ac - Screw No 10 A No
RS Stock No. 331-0158
Mfr. Part No.ZB4BZ101
£5.59
Each
Units
Contact Block 1NO Harmony XB4 - 600 V - Screw Yes 10 A -
RS Stock No. 331-0574
Mfr. Part No.ZENL1111
£6.06
Each
Units
Contact Block 1NO Harmony XAL - - - Screw No 10 A -
RS Stock No. 331-0580
Mfr. Part No.ZENL1121
£6.06
Each
Units
Contact Block 1NC Harmony XAL - - - Screw No - -
RS Stock No. 331-0164
Mfr. Part No.ZB4BZ102
£5.59
Each
Units
Contact Block 1NC Harmony XB4 - 600 V - Screw Yes - -
RS Stock No. 815-1676
Mfr. Part No.ZB2BE101
£4.81
Each
Units
Contact Block 1NO XB2 - 600 V - Screw - 10 A -
RS Stock No. 610-2944
Mfr. Part No.ZBVM3
£14.26
Each
Units
Light Block - Harmony XB Green 230 V LED Screw No - Yes
RS Stock No. 610-2821
Mfr. Part No.ZBVB3
£6.53
Each
Units
Light Block - Harmony XB Green 24 V LED Screw No - -
RS Stock No. 815-1670
Mfr. Part No.ZB2BE102
£4.72
Each
Units
Contact Block 1NC XB2 - 600 V - Screw - 10 A -
RS Stock No. 610-2815
Mfr. Part No.ZBVB1
£6.52
Each
Units
Light Block - Harmony XB White 24 V LED Screw No - -
RS Stock No. 260-154
Mfr. Part No.33E01
BrandBACO
£3.33
Each (In a Pack of 5)
Units
Contact Block 1NC BACO - 600 V - Screw No 10 A -
RS Stock No. 610-2938
Mfr. Part No.ZBVM1
£14.39
Each
Units
Light Block - Harmony XB White 230 V LED Screw No - Yes
RS Stock No. 260-104
Mfr. Part No.33E10
BrandBACO
£3.096
Each (In a Pack of 5)
Units
Contact Block 1NO BACO - 600 V - Screw No 10 A -
RS Stock No. 411-1340
Mfr. Part No.3SB3400-0B
BrandSiemens
£4.23
Each
Units
Contact Block 1NO Siemens 3SB3 - - - Screw No 10 A -
RS Stock No. 411-1362
Mfr. Part No.3SB3400-0C
BrandSiemens
£4.23
Each
Units
Contact Block 1NC Siemens 3SB3 - - - Screw No 10 A No
RS Stock No. 610-2837
Mfr. Part No.ZBVB4
£6.50
Each
Units
Light Block - Harmony XB Red 24 V LED Screw No - -
RS Stock No. 331-0192
Mfr. Part No.ZB4BZ105
£9.31
Each
Units
Contact Block 1NO 1NC Harmony XB4 - - - Screw Yes 10 A -
RS Stock No. 330-9596
Mfr. Part No.ZB4BVB3
£8.64
Each
Units
Light Block - Harmony XB4 Green 24 V LED Screw Yes - Yes
RS Stock No. 609-6827
Mfr. Part No.XENG1191
£16.39
Each
Units
Contact Block 1 NC, 2NO XENG - - - - - 10 A -
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