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Ross Hill 0100-0389-02: DC Contactor (1800/C)

The Ross Hill 1800 A / 74 VDC DC contactor, with the identification details that distinguish it from the Eaton contactor carrying the same headline rating.

Independent supplier. RHCC 0100-0389-02 is identified from the installed number. Manufacturer and trademark names are used for reference only, and condition is disclosed before sale.

Part number	0100-0389-02
Manufacturer	Ross Hill / NOV
Designation	Ross Hill 1800/C
Type	DC contactor
Rating on file	1800 A, 74 VDC
System	Ross Hill / Hill Hayes / NOV SCR drilling
Condition	New-surplus, used-tested, reconditioned

Also searched as

0100-0389-02 · 0100038902 · 0100-0389 · 1800/C · 1800C · Ross Hill 1800 amp contactor · Ross Hill DC contactor

The confusion this page exists to resolve

There are two different 1800 A / 74 VDC DC contactors associated with Ross Hill SCR equipment:

This one: 0100-0389-02, the Ross Hill 1800/C.
The Eaton / Cutler-Hammer 6702ED584, catalogued by Ross Hill as 0401-0021-00.

Identical headline ratings do not establish interchangeability across different manufacturers and part numbers. If a secondary reference conflicts with the hardware in the bay, use the physical nameplate and send clear label photographs.

Working from the Eaton side instead? See the Eaton / Cutler-Hammer 6702ED584 page, which covers the 6702ED family and the coil-voltage suffixes.

What it does

DC contactors in an SCR bay make and break the DC power feed to the drilling motors and handle drive assignment: connecting a given SCR bay to the drawworks, a mud pump, or the rotary table. They switch high DC current, which is electrically harder than switching AC because there is no natural current zero to help extinguish the arc. That is why these are heavy, purpose-built devices with blowout arrangements rather than general-purpose contactors.

It is also why they wear. Contact erosion is the normal failure mode, and it is load-dependent rather than time-dependent.

Symptoms that point here

What you are seeing	What it usually indicates
Contactor will not pull in	Coil or control circuit: verify coil voltage first
Chatter or drop-out under load	Coil supply or worn contacts
Visible pitting, welding, or material transfer on the tips	Contacts at end of life
Drive assignment does not follow the console selection	Contactor or its control, not necessarily the drive
Arcing or scorching in the bay	Stop and investigate before re-energising
Contactor chatter, failure to pull in, or welded contacts	Verify coil voltage against the suffix, and do not swap with the Eaton 6702ED584: same headline rating, different part

Nameplate

We verify the number and rating against the physical unit before quoting and send photos of the nameplate on the unit being offered. Because two different 1800 A contactors exist in this equipment, the physical nameplate is the decisive identification point.

What to send us

These are the details that let us identify the right unit instead of guessing at it.

The number exactly as it reads on the contactor nameplate
The manufacturer name on the plate, if any
Coil voltage
Whether the application is reversing or non-reversing
Rig, SCR bay, and what the contactor feeds
A photo of the nameplate and the contactor in place
Quantity and your need-by date

Condition and sourcing

RHCC 0100-0389-02 is quoted only after current availability, condition, and lead time are confirmed. Any offered unit is identified as new-surplus, used-tested, or reconditioned before sale.

If the observed failure does not line up with RHCC 0100-0389-02, use the SCR Drive Fault Finder to narrow the subsystem before requesting a part.

Identification checkpoint

For RHCC 0100-0389-02, confirm rating on file: 1800 A, 74 VDC; designation: Ross Hill 1800/C; type: DC contactor. Use the installed label and complete suffix before treating another item as equivalent.

FAQ

What is the Ross Hill 0100-0389-02?

It is a Ross Hill 1800/C DC contactor identified at 1800 A with a 74 VDC coil.

Is it the same as the Eaton 6702ED584?

No. Both are 1800 A 74 VDC DC contactors and both turn up in this equipment, which is exactly why they get confused. They are separate parts from separate manufacturers with separate part numbers. We do not treat them as interchangeable and neither should a purchase order.

What does 1800/C mean?

It is the Ross Hill designation shown with this part number. The 1800 corresponds to the current rating; order by the complete 0100-0389-02 identifier and physical nameplate.

How do I tell which contactor I have?

The nameplate. An Eaton / Cutler-Hammer unit will carry a 6702ED-family number; the Ross Hill unit carries the Ross Hill number. If the plate is unreadable, photograph the contactor and the surrounding bay and send it to us.

Can you supply one?

We source Ross Hill contactors as new-surplus, used-tested, and reconditioned, with condition disclosed before sale. Send the number and we will tell you what we can actually find.

Availability & Quote

For RHCC 0100-0389-02, condition is disclosed before sale. Item photographs are supplied with an actual offer.

Request a quote by emailing sales@edmundsonindustrial.com or by calling (832) 975-8827

Eaton / Cutler-Hammer 6702ED584 SCR Bay Components SCR House Replacement Parts Ross Hill / NOV Cross-Reference Ross Hill / NOV

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