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. 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. 342-2908
Mfr. Part No.ZB5AZ103
HK$68.99
Each
units
Harmony XB5 Contact Block 2NO - - - Screw Yes 10 A - - -
RS Stock No. 609-3165
Mfr. Part No.ZB5AZ105
HK$85.70
Each
units
Harmony XB5 Contact Block 1NO 1NC - - - Screw Yes 10 A - - -
RS Stock No. 330-9782
Mfr. Part No.ZB4BW065
HK$126.00
Each
units
Harmony XB4 Contact & Light Block 1NO 1NC - 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. 609-6833
Mfr. Part No.XENG1491
HK$191.33
Each
units
XAC, XACA, XACA9 Contact Block - - - - - - - - - -
RS Stock No. 422-8634
Mfr. Part No.ZB5AW0M55
HK$174.00
Each
units
Harmony XB5 Contact & Light Block - Orange - - - Yes - - - -
RS Stock No. 331-0445
Mfr. Part No.ZB5AZ101
HK$45.52
Each
units
Harmony XB5 Contact Block 1NO - - - Screw Yes - - - -
RS Stock No. 331-0530
Mfr. Part No.ZALVB4
HK$72.47
Each
units
Harmony ZALV Light Block - Red 24 V LED Screw No - Yes - -
RS Stock No. 331-0574
Mfr. Part No.ZENL1111
HK$47.86
Each
units
Harmony XAL Contact Block 1NO - - - Screw No 10 A - - -
RS Stock No. 609-6877
Mfr. Part No.XESD1291
HK$1,339.80
Each
units
XAC Contact Block 2NO 1CO - - - Screw No - No - -
RS Stock No. 742-9565
Mfr. Part No.3SB3423-1PE
BrandSiemens
HK$69.62
Each
units
Siemens 3SB3 Light Block - White 24 V LED Cage Clamp No - Yes - -
RS Stock No. 260-255
Mfr. Part No.33EARL
BrandBACO
HK$85.06
Each
units
BACO Light Block - Red 24 V LED Screw No - Yes - -
RS Stock No. 399-3703
Mfr. Part No.M22-LEDC-G
BrandEaton
HK$65.55
Each
units
M22 Light Block - Green 12 → 30 V ac/dc LED Screw No 15 mA Yes - -
RS Stock No. 847-5433
Mfr. Part No.M22-XLED230-T
BrandEaton
HK$192.94
Each
units
M22 Test Element - - 85 → 264 V ac - Screw No - - - -
RS Stock No. 610-2966
Mfr. Part No.ZBVM5
HK$159.71
Each
units
Harmony XB Light Block - Orange 230 V LED Screw No - Yes - -
RS Stock No. 455-5346
Mfr. Part No.3SB3420-1A
BrandSiemens
HK$46.68
Each
units
Siemens 3SB3 Light Block - - - BA9S Bulb Screw No - No - -
RS Stock No. 399-3775
Mfr. Part No.M22-LEDC230-W
BrandEaton
HK$111.00
Each
units
M22 Light Block - White 85 → 264 V ac LED Screw No 15 mA Yes - -
RS Stock No. 742-9492
Mfr. Part No.3SB3400-0DA
BrandSiemens
HK$136.50
Each
units
Siemens 3SB3 Contact Block 2NO - - - Screw No 10 A - - -
RS Stock No. 757-8929
Mfr. Part No.1SFA611610R1001
BrandABB
HK$34.05
Each
units
ABB Modular Contact Block 1NO - - - - No - - - -