What to Do When Industrial Electrical Parts Become Obsolete

When an industrial electrical part is obsolete, you rarely need to redesign the panel. Record the nameplate data, find the OEM part number, cross-reference it to a replacement, verify the ratings and fit, then order. BRAH Electric makes aftermarket replacements for contactors, overload relays, coils, contact kits, breaker rating plugs and trip accessories, and bus plugs from the OEM lines listed in the three tables below.

Obsolete part replacement at a glance

• Record everything on the nameplate before the part leaves the panel.
• Find the OEM part number on the device, the drawings or an old purchase order.
• Cross-reference it: type the OEM number into site search.
• Verify ratings and fit against the old part, field by field.
• Order, then add the replacement number to your spares list.

What obsolete means for an electrical part

A part is obsolete when the original manufacturer has stopped making and supporting it. The equipment around it is usually still serviceable: the bus, the enclosure, the wiring and the other devices have years left. That leaves three routes. You can fit the OEM successor line, which may have different dimensions, terminals or accessories. You can buy surplus or used stock, with whatever history comes with it. Or you can fit an aftermarket replacement built to take the place of the original part number.

The third route is what this guide covers. It works when the replacement is listed against the exact OEM number and you confirm the ratings yourself. It fails when someone orders by appearance or by a partial number.

Five steps to replace an obsolete part

1. Record the nameplate data

Photograph the label and the part in place, then write down what matters for that part type:

• Contactor: full part number, coil voltage and frequency, number of poles, auxiliary contacts.
• Overload relay: full part number and the current setting range.
• Magnetic coil: the number printed on the coil, voltage and frequency, and the contactor it came out of.
• Contact kit: the contactor part number and size, and the number of poles.
• Rating plug: catalog number, ampere rating, and the breaker frame and trip unit it plugs into.
• Shunt trip or undervoltage release: catalog number, control voltage, and the breaker frame.
• Bus plug: catalog number, amperage, voltage, wire count, ground, and the busway series from the busway nameplate.

2. Find the OEM part number

The OEM number is the key to every cross-reference. Copy it exactly, including dashes and suffix letters: a suffix often carries the coil voltage or the contact arrangement. If the label is burnt or missing, look at an identical device elsewhere in the line-up, the bill of materials on the panel drawings, the panel schedule, or past purchase orders.

3. Cross-reference the number

Search the OEM number in the catalogue. BRAH part numbers usually keep the OEM number inside them, which makes a match easy to see: LC1D0910 is listed under BLC1D0910, 3TF4022 under B3TF4022, and SRPG600A600 under BE-SRPG600A600. Bus plugs are the exception, with their own BRAH type letters, so use the table further down or search the OEM catalog number.

4. Verify ratings and fit

Open the product page and compare its specification fields with your notes: amperage, voltage, poles, coil voltage and frequency, auxiliary contacts, and the OEM line. Treat the amperage on the page as the catalogue rating and match it to the nameplate of the old part. Do not read it as a motor rating, because the figure is not stated on the same basis across every OEM line. If any field differs from the old part, stop and ask before ordering.

5. Order and update your records

Once the part is confirmed, write the BRAH number next to the OEM number in your spares list and on the panel drawings. When one part in a line-up has gone obsolete, the others of the same line will need the same answer later, and the cross-reference is quicker the second time.

How site search by OEM part number works

The search box at the top of every page, and the address https://www.brahelectric.com/products?search= followed by a part number, search the catalogue records, including the OEM part number each record lists. Three things are worth knowing.

• An exact OEM number returns the BRAH parts listed against it. Searching LC1D0910 returns BLC1D0910 and its coil-voltage versions.
• Upper or lower case does not matter, and dashes are kept: 6-22-2 finds the contact kit B6-22-2.
• A shorter number widens the search. LC1D09 returns the LC1D09 contactors plus the coils, auxiliary contacts, overload relays and interlock listed for them. Use this when part of the label is unreadable, then narrow down by the specification fields.

A search by OEM number confirms that a cross-reference exists. It does not replace step 4. For anything search does not find, call (855) 355-2724 with the part number.

Motor control OEM lines with aftermarket replacements

Each row is one part type for one OEM line, with the OEM part series the catalogue covers and one worked example that links to the product page. The part type links to the full listing, where you can filter by line.

Related guides: Siemens 3TF contactor replacement options, replacing an LC1D4011 contactor, troubleshooting overload relays, what arc chutes do, identifying MCC replacement parts.

Circuit breaker OEM lines with replacement parts

These are parts for breakers, not complete breakers: the plug or accessory that has failed or gone missing on a breaker that is otherwise sound.

The Circuit Breakers category also holds face plates for General Electric Power Break I and HPC II, miscellaneous repair parts and mounting brackets. Related guides: the GE SRPG600A600 rating plug and the GE TPUV8 undervoltage release.

Busway lines with replacement fusible bus plugs

Every row links to an example in the fusible bus plugs listing. A bus plug fits one busway family only, so the busway nameplate decides the row.

The catalogue marks five of these OEM lines as obsolete: General Electric Armor Clad and Type FVK, and ITE / Siemens BD Series, XL-U Series and XL-X Series.

When the plug body is sound, a smaller part may be all you need. The Bus Plugs category lists stabs, stab insulators, ground kits, neutral kits, conversion kits and fuse clips. Related guides: Square D bus plug cross reference, bus plug stabs and fuse classes in bus plugs.

What to check before you order

• The OEM number on the product page matches the number on your part, character for character.
• Coil or control voltage and frequency match the control circuit.
• Poles and auxiliary contacts match the old device.
• The amperage shown matches the nameplate of the part being replaced.
• For breaker parts, the breaker frame and trip unit are the ones named on the product page.
• For bus plugs, the busway family, voltage, wire count and ground match.

BRAH Electric is an aftermarket manufacturer and is not an authorized distributor of the OEM brands named in this guide. Its parts are designed in-house and tested at its Carlsbad, California facility. They carry a 2-year warranty from the date of invoice; contact kits carry 6 months. In-stock orders placed before 3:00 PM Pacific ship the same business day, and shipping is calculated at checkout. Returns need an RMA within 30 days of shipment and are subject to a 25 to 50 percent restocking charge, which makes the checks above worth the ten minutes.

Safety when replacing obsolete parts

Old equipment is often poorly labelled and may have been modified since the drawings were made. Before removing any part, de-energize the equipment, apply lockout/tagout, and verify the absence of voltage. Remember that control circuits can be fed from a separate source. The work is for qualified personnel following the site electrical safety program.

Obsolete electrical parts FAQs

What makes an industrial electrical part obsolete?

The original manufacturer has stopped producing and supporting it. The part may still appear in old catalogues and on drawings, but it can no longer be ordered new from the OEM.

Can an aftermarket part replace any obsolete component?

No. It can replace the parts a manufacturer has built a replacement for. The tables in this guide show the OEM lines and part types BRAH Electric covers. For anything not in the tables, call (855) 355-2724 with the part number.

What if I do not know the part number?

Record every marking that is still legible, photograph the part and where it mounts, and note the ratings of the equipment it sits in. A partial number can be searched, and the specification fields on the results help narrow it down. Phone support is available Monday to Friday, 6AM to 5PM Pacific.

Should I replace the whole system when one part goes obsolete?

Not on that basis alone. If the rest of the equipment is in good condition and a replacement is listed for the exact OEM number, replacing the part is the smaller job. A retrofit makes sense when the equipment itself is damaged or no longer suits the load.

How do I check that a cross-reference is correct?

Confirm that the product page lists your OEM number, then compare every specification field with the old nameplate. If you have a second identical device in service, compare against its label as well.

References

• NFPA 70B: standard for electrical equipment maintenance.
• OSHA 29 CFR 1910.147: control of hazardous energy (lockout/tagout).
• NFPA 70E: standard for electrical safety in the workplace.
• IEC 60947-4-1: the IEC standard for contactors and motor-starters.