Ross Hill 0521-2400-21: Part Number Identification

Independent supplier. RHCC 0521-2400-21 is identified from the installed number. Manufacturer and trademark names are used for reference only, and condition is disclosed before sale.

Also searched as

0521-2400-21 · 0521240021 · 05212400 21 · 0521-2400 · 2400-21 · Ross Hill DC control module · RHCC DC module

Why this number requires label confirmation

0521-2400-21 should be matched only to the complete identifier printed on the physical board. The established AC-control family uses the 0521-2500 prefix, while the established DC-control family uses 0522-2400. That pattern makes the prefix an essential ordering detail.

This page preserves the exact search path without assigning unsupported specifications or interchangeability. For a standard DC control module marked 0522-2400-21, use the verified 0522-2400-21 page; that number cross-references to NOV 6415-2400-21.

How the number families differ

Ross Hill 0521-2500 identifies the AC-control family; Ross Hill 0522-2400 identifies the DC-control family. The prefix and middle group are part of the identity, not optional formatting.

Do not convert 0521-2400-21 into another number on a purchase order. Read the complete board label, preserve every dash group, and quote the item exactly as marked.

Number relationships

How to identify the installed board

Read the complete physical label and send a clear photograph with the quotation request. Do not order from a shortened number or a secondary reference.

• Read the complete number as printed, including the prefix group: 0521 or 0522
• Check for a second number on the same label: Ross Hill and NOV numbers often both appear
• Note whether the module is doing regulation, standard control, or a field-specific job
• Photograph the label and the card edge

If the board reads 0522-2400-21, see the 0522-2400-21 product page, including the NOV 6415-2400-21 cross-reference. If the physical board reads 0521-2400-21, send that label unchanged for exact-match sourcing.

If the observed failure does not line up with RHCC 0521-2400-21, use the SCR Drive Fault Finder to narrow the subsystem before requesting a part.

Ordering boundary

0521-2400-21 is not published as interchangeable with 0522-2400-21. Prefixes and dash suffixes can identify different functions, calibrations, frequencies, field configurations, or coil voltages. Match the complete physical identifier.

See the Ross Hill / NOV cross-reference for nearby numbers that require careful distinction.

What to send us

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

• The complete number exactly as printed, prefix group included
• Any second number on the same label
• Any revision letter or date code
• Rig, drive, and what the module is assigned to (drawworks, mud pump, rotary table)
• What the system is doing that led you here
• A photo of the board label if you can take one
• Quantity and your need-by date

Condition and sourcing

RHCC 0521-2400-21 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.

Related

FAQ

Availability & Quote

For RHCC 0521-2400-21, condition is disclosed before sale. Item photographs are supplied with an actual offer.