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. 610-2792
Mfr. Part No.ZBE204
HK$87.22
Each
units
Harmony XB Contact Block 2NC - - - Screw No - -
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. 260-233
Mfr. Part No.33EAWL
BrandBACO
HK$73.15
Each
units
BACO Light Block - White 24 V LED Screw No - Yes
RS Stock No. 331-0580
Mfr. Part No.ZENL1121
HK$62.05
Each
units
Harmony XAL Contact Block 1NC - - - Screw No - -
RS Stock No. 331-0372
Mfr. Part No.ZB5AVB3
HK$62.78
Each
units
Harmony XB5 Light Block - Green 24 V ac/dc LED Screw Yes - Yes
RS Stock No. 609-2746
Mfr. Part No.ZB4BW0G35
HK$161.00
Each
units
Harmony XB4 Contact & Light Block 1NO 1NC Green 110 → 120 V ac LED Screw Yes 10 A Yes
RS Stock No. 610-2916
Mfr. Part No.ZBVG4
HK$95.83
Each
units
Harmony XB Light Block - Red - LED Screw No - -
RS Stock No. 610-2950
Mfr. Part No.ZBVM4
HK$124.68
Each
units
Harmony XB Light Block - Red 230 V LED Screw No - Yes
RS Stock No. 411-1362
Mfr. Part No.3SB3400-0C
BrandSiemens
HK$37.58
Each
units
Siemens 3SB3 Contact Block 1NC - - - Screw No 10 A No
RS Stock No. 610-2871
Mfr. Part No.ZBVBG3
HK$89.06
Each
units
Harmony XB Light Block - Green 24 → 120 V LED Screw No - -
RS Stock No. 330-9760
Mfr. Part No.ZB4BW061
HK$87.00
Each
units
Harmony XB4 Contact & Light Block 1NO - 250 V - Screw Yes 10 A No
RS Stock No. 742-9568
Mfr. Part No.3SB3400-0AA
BrandSiemens
HK$103.55
Each
units
Siemens 3SB3 Contact Block 1NO 1NC - - - Screw No 10 A -
RS Stock No. 610-2938
Mfr. Part No.ZBVM1
HK$148.41
Each
units
Harmony XB Light Block - White 230 V LED Screw No - Yes
RS Stock No. 742-9458
Mfr. Part No.3SB3400-0BA
BrandSiemens
HK$66.79
Each
units
Siemens 3SB3 Contact Block 1NO - - - Screw No 10 A -
RS Stock No. 609-6833
Mfr. Part No.XENG1491
HK$191.33
Each
units
XAC, XACA, XACA9 Contact Block - - - - - - - -
RS Stock No. 833-6770
Mfr. Part No.HW-C10
BrandIdec
HK$47.14
Each
units
- - - - - - - - - -
RS Stock No. 260-154
Mfr. Part No.33E01
BrandBACO
HK$33.15
Each (In a Pack of 5)
units
BACO Contact Block 1NC - 600 V - Screw No 10 A -
RS Stock No. 422-8347
Mfr. Part No.ZB5AVB1
HK$60.89
Each
units
Harmony XB5 Light Block - White 24 V ac/dc LED Screw Yes - Yes
RS Stock No. 760-4687
Mfr. Part No.M22-SWD-LED-B
BrandEaton
HK$189.00
Each
units
M22 Light Block - Blue - LED Smartwire No 15 mA Yes
RS Stock No. 422-8634
Mfr. Part No.ZB5AW0M55
HK$174.00
Each
units
Harmony XB5 Contact & Light Block - Orange - - - Yes - -
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