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. 331-0401
Mfr. Part No.ZB5AVB5
MYR47.13
Each
units
Harmony XB5 Light Block - - 24V ac/dc LED Screw Yes - Yes - -
RS Stock No. 422-8858
Mfr. Part No.ZB6E2B
MYR18.31
Each
units
Harmony XB6 Contact Block 1NC - - - - - - - - -
RS Stock No. 331-0467
Mfr. Part No.ZB5AZ102
MYR25.04
Each
units
Harmony XB5 Contact Block 1NC - - - Screw Yes 10A - - -
RS Stock No. 526-8633
Mfr. Part No.3LD9220-0C
BrandSiemens
MYR72.60
Each
units
- - - - - - - - - - - -
RS Stock No. 609-2718
Mfr. Part No.ZB4BW0B15
MYR108.23
Each
units
Harmony XB4 Contact & Light Block 1NO 1NC - 24V ac/dc LED Screw Yes 10A Yes - -
RS Stock No. 342-0463
Mfr. Part No.ZB6Z1B
MYR36.75
Each
units
Harmony XB6 Contact Block 1NO - - - Faston Yes - - - -
RS Stock No. 609-3121
Mfr. Part No.ZB5AW0B31
MYR89.09
Each
units
Harmony XB5 Contact & Light Block 1NO - 24V ac/dc LED Screw Yes 10A Yes - -
RS Stock No. 331-0530
Mfr. Part No.ZALVB4
MYR36.93
Each
units
Harmony ZALV Light Block - - 24V LED Screw No - Yes - -
RS Stock No. 330-9956
Mfr. Part No.ZB4BW0M31
MYR133.91
Each
units
Harmony XB4 Contact & Light Block 1NO - 230 → 240V ac LED Screw Yes 10A Yes - -
RS Stock No. 349-1550
Mfr. Part No.ZB6EB4B
MYR47.91
Each
units
Harmony XB6 Light Block - - 30V ac/dc LED - Yes 15mA - - -
RS Stock No. 553-989
Mfr. Part No.ZBVM45
MYR112.39
Each
units
Harmony XB Light Block - Red 230V LED Screw Clamp No - Yes - -
RS Stock No. 411-1952
Mfr. Part No.3SB3400-1PA
BrandSiemens
MYR35.19
Each
units
Siemens 3SB3 Light Block - - 24V LED Screw No - Yes - -
RS Stock No. 847-5162
Mfr. Part No.121474 & M22-K02SMC10
BrandEaton
MYR150.83
Each
units
M22 Contact Block 2NC+NO - 500V - Screw Yes 4A - - -
RS Stock No. 422-8426
Mfr. Part No.ZB5AW31
MYR37.80
Each
units
Harmony XB5 Light Block - - - - - - - - - -
RS Stock No. 553-955
Mfr. Part No.ZB4BZ1045
MYR54.15
Each
units
Harmony XB4 Contact Block 2NC - - - Screw Yes 10A - - -
RS Stock No. 609-4562
Mfr. Part No.XACS102
MYR103.12
Each
units
Harmony XAC Contact Block 1NC - - - - - - - - -
RS Stock No. 610-2966
Mfr. Part No.ZBVM5
MYR97.74
Each
units
Harmony XB Light Block - - 230V LED Screw No - Yes - -
RS Stock No. 342-2908
Mfr. Part No.ZB5AZ103
MYR43.40
Each
units
Harmony XB5 Contact Block 2NO - - - Screw Yes 10A - - -
RS Stock No. 724-9568
Mfr. Part No.ZBE503
MYR80.82
Each
units
Harmony XB Contact Block 2NO - - - Screw No - - - -
RS Stock No. 874-2162
Mfr. Part No.3SU1400-2AA10-1CA0
BrandSiemens
MYR35.40
Each
units
SIRIUS ACT Contact Block 1NC - 5 → 500V ac/dc - Screw No 10A No - -