MD Central Vacuum
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Since 1961

28 amp Relay (replaces all relays, requires large transformer)

4.10 Stars
4.10 / 5 Stars
28 amp Relay
  • 28 amp Relay
  • 28 amp Relay

Product Details

RELAY MUST BE MOUNTED RIGHT SIDE UP TO WORK (sticker/wording pointing up). See our Relay Bracket (usually below this relay listing) to make upside down applications right side up.

This relay replaces the smaller ones previously sold (#240 and #241). It ONLY WORKS WITH LARGE 24-VOLT TRANSFORMERS (PART #232 if 110-120 volt or #231L if 220-240 volt) which are typically not in machines under 20 amps - regardless of what you read elsewhere on this website, this relay requires the larger 24-volt transformer. You can replace your transformer with a heavier duty one.

The 242 relay works with all kinds of 110 to 240 volt motors, and all mini breakers. It works with an electrical set-up similar to the ones in the following photographed diagrams. Click and print a diagram for wiring a SINGLE MOTOR VACUUM, or DUAL MOTOR VACUUM under 16 amps, or DUAL MOTOR VACUUM over 16 amps. (When in doubt on amps use the diagram for the larger amps.) Use 14 or 16 gauge wires and put on 1/4 inch flag terminals (all available at hardware stores). Use 12 gauge wire for dual motor setups over 17 amps.

To mount it you MUST HAVE 4 x 2.5 inches of space. Do not allow any metal on the relay (besides the bottom) to touch any metal parts on the vacuum except the wires. There are several "feet" on the bottom to use screws (not included) to secure it.

Replaces Omron Relays. Has MFG# DP2020A5021. NOTE: Mid-2004 circuit boards became more popular.

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$75.23
Part #242
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Latest Top Reviews

5 Stars

Oct 5 2013 4:15AM
fixed my old kenmore central house vaccum using this relay and new transformer. working fine.

5 Stars

Nov 2 2012 2:08PM
The part works perfectly - was just the right fix. Thank you!!!

5 Stars
Apr 25 2011 7:09AM
Great relay for my central vac system. Much more effective than the original one that failed due to design flaws. Highly recommend.

5 Stars
Jul 2 2010 8:29AM
It is working great. Thank you Loren

5 Stars

Oct 16 2009 10:09AM
Great service with easy to understand instructions. Good installation instructions. works great. Thank You