Allen Bradley 800T/H 30mm Button Troubleshooting and Replacement Guide

Preventive replacement of contact blocks: After 5 years of continuous operation or 500000 operations, it is recommended to replace all contacts, especially in dusty or corrosive environments.

6.4 Suggestions for Inventory Spare Parts

To reduce downtime, the following commonly used parts should be stocked on site:

Two instant action button heads of each color (green, red, yellow, black)

Emergency stop button head (push-pull or rotary release) 1-2 pieces

2-position selector switch head (standard knob) 1 piece

5 standard contact blocks (1NO+1NC)

3 PentUFF contact blocks (1NO+1NC)

Installation ring and sealing gasket set 1 pack

Chapter 7: When 800T/H cannot be replaced - Whole station upgrade plan

Although the 800T/H series has not been discontinued, some special colors, contact configurations, or old-fashioned lock cylinder selectors may no longer be available. At this point, the following alternative solutions can be considered:

Using a standard 800T/H module combination: For example, a three position selector switch requires two sets of NO contacts, but the standard model only has 1NO+1NC, which can be achieved by adding an additional second contact block (stacked design).

Panel hole adapter: If you need to replace buttons with larger sizes (such as 22mm), you can use a conversion installation ring (provided by a third party).

Overall panel replacement: For severely aged consoles, it is recommended to directly replace them with pre assembled 800T/H assembly stations (such as 800T-2TA dual button stations), which provide complete pre wired enclosures to reduce on-site wiring errors.

Upgrade suggestion: When the entire control cabinet needs to undergo PLC upgrade, replace all buttons and indicator lights with 800T/H models with PentUFF contact blocks, which can significantly improve the reliability of low-level signals and reduce maintenance frequency in the later stage.