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
RS Stock No. 331-0473
Mfr. Part No.ZBE101
HK$39.01
Each
units
Harmony XB Contact Block 1NO - - - Screw No 10 A → 600 V ac No
RS Stock No. 331-0489
Mfr. Part No.ZBE102
HK$39.01
Each
units
Harmony XB Contact Block 1NC - 600 V ac - Screw No 10 A No
RS Stock No. 815-1676
Mfr. Part No.ZB2BE101
HK$75.54
Each
units
XB2 Contact Block 1NO - 600 V - Screw - 10 A -
RS Stock No. 815-1670
Mfr. Part No.ZB2BE102
HK$77.60
Each
units
XB2 Contact Block 1NC - 600 V - Screw - 10 A -
RS Stock No. 610-2944
Mfr. Part No.ZBVM3
HK$133.76
Each
units
Harmony XB Light Block - Green 230 V LED Screw No - Yes
RS Stock No. 609-6827
Mfr. Part No.XENG1191
HK$324.08
Each
units
XENG Contact Block 1 NC, 2NO - - - - - 10 A -
RS Stock No. 610-2972
Mfr. Part No.ZBVM6
HK$159.60
Each
units
Harmony XB Light Block - Blue 230 V LED Screw No - Yes
RS Stock No. 610-2922
Mfr. Part No.ZBVG5
HK$81.48
Each
units
Harmony XB Light Block - Orange - LED Screw No - -
RS Stock No. 187-223
Mfr. Part No.ZB2BV006
HK$62.69
Each
units
- Contact & Light Block - - - - - - - -
RS Stock No. 331-0467
Mfr. Part No.ZB5AZ102
HK$40.74
Each
units
Harmony XB5 Contact Block 1NC - - - Screw Yes 10 A -
RS Stock No. 411-1946
Mfr. Part No.3SB3400-1PB
BrandSiemens
HK$52.49
Each
units
Siemens 3SB3 Light Block - Red 24 V LED Screw No - Yes
RS Stock No. 610-2900
Mfr. Part No.ZBVG3
HK$96.34
Each
units
Harmony XB Light Block - Green 110 → 120 V LED Screw No - -
RS Stock No. 553-983
Mfr. Part No.ZBVM55
HK$146.50
Each
units
Harmony XB Light Block - Orange 230 V LED Cage Clamp No - Yes
RS Stock No. 331-0388
Mfr. Part No.ZB5AVB4
HK$62.78
Each
units
Harmony XB5 Light Block - Red 24 V ac/dc LED Screw Yes - Yes
RS Stock No. 331-0186
Mfr. Part No.ZB4BZ103
HK$95.32
Each
units
Harmony XB4 Contact Block 2NO - 600 V - Screw Yes 10 A -
RS Stock No. 260-429
Mfr. Part No.33EAYL
BrandBACO
HK$85.06
Each
units
BACO Light Block - Yellow 24 V LED Screw No - Yes
RS Stock No. 746-9009
Mfr. Part No.XACS101
HK$145.86
Each
units
Harmony XAC Contact Block 1NO - - - - - - -
RS Stock No. 331-0158
Mfr. Part No.ZB4BZ101
HK$57.24
Each
units
Harmony XB4 Contact Block 1NO - 600 V - Screw Yes 10 A -
RS Stock No. 331-0192
Mfr. Part No.ZB4BZ105
HK$92.22
Each
units
Harmony XB4 Contact Block 1NO 1NC - - - Screw Yes 10 A -
RS Stock No. 610-2792
Mfr. Part No.ZBE204
HK$87.22
Each
units
Harmony XB Contact Block 2NC - - - Screw No - -
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