Update 5-8-2020
You can also purchase the LED lamps from www.jkllamps.com For example PN LE-0509-01W is the white one. Search for Wedge Base LED.
The EMO box (Emergency OFF) used on many PHI systems has switches that can become noisy, stick or fail to operate at all. These switches are used to turn on and off the card rack power, main electronics console power, vacuum console power, bakeout power and to turn off and reset all power.
Another very common issue is that the light bulbs in the switches tend to burn out on a yearly basis. This blog post will describe where to get replacement parts for the EMO boxes.
The round red EMO button switch is still available but the original square push button switches that were produced by Cutler-Hammer (now Eaton) are very difficult to find. Honeywell equivalents are listed below.
There are two styles of EMO boxes. The 32-005 style has a Bakeout switch and the other style has a Vacuum Console power switch.
Equivalent replacement switches produced by Honeywell are listed below.
| EMO button | McMaster-Carr PN 7403K42 |
| Main Power ON/Reset | Honeywell PN #: AML21CBA3AC Allied Electronics Stock #: 70119090 |
| Main Power / OFF | Honeywell PN #: AML21CBA3AC Allied Electronics Stock #: 70119090 |
| Electronics Console Power | Honeywell PN #: AML21CBE2AD Allied Electronics Stock #: 70119866 |
| Vacuum Console Power | Honeywell PN #: AML21CBE2AD Allied Electronics Stock #: 70119866 |
| Card rack power | Honeywell PN #: AML21CBE2AD Allied Electronics Stock #: 70119866 |
| Bake Out Power | Honeywell PN #: AML21CBE2AD Allied Electronics Stock #: 70119866 |
Original lamp –
Lamp; Incandescent; T-1 3/4; Sub-Mini Wedge; 28V; 40mA; 0.3MSCP; 7000 Hrs
Manufacturer #: 85
Allied Stock #: 70013004
Recommended LED replacement lamp –
Lamp; LED; T-1 3/4; Sub-Mini Wedge; White; 28V; 40mA; 0.3MSCP; Lamp life 30,000 hours.
Manufacturer #: LED-24-T1.75 WEDGE-W Allied Stock #: 70012994
These LED lamps are more expensive but will last for almost 4 years compared to about 1 year for the regular tungsten lamps.
Mouser PN 560-LE-0509-01W is a white LED that would work for all of the switches and it costs less. Made by JKL Components https://www.mouser.com/datasheet/2/208/LE-0509-01-21680.pdf
Bonus – EMO box schematics are shown below
