Legacy SCR Electrical Equipment
The parts everyone else no-quotes.
We are experts at identifying and supplying obsolete electrical equipment for the crews keeping DC SCR houses working. Ross Hill, NOV, Canrig, Omron, IPS, and the oddball parts that pull zero results on search engines.
What keeps a DC rig working
This is where the high-dollar equipment and the longest downtime can sit: complete control modules, power-conversion assemblies, high-current contactors, dynamic braking, generator controls, and driller's console assemblies.
AC/DC Control Modules
Ross Hill and NOV AC firing and assignment modules, plus DC field and regulation modules. Complete dash suffixes matter.
0521-2500 · 0522-2400 · 0521-2400View control-module families → Complete power sectionSCR Bridges & Phase Cells
Model 1400 bridge assemblies, Model 1500 phase cells, thyristors, Westcode diodes, semiconductor fuses, bus, and cooling hardware.
0001-6307-70 · 0100-0150-03View drilling power modules → High-current switching1,800–3,000 A DC Contactors
Assignment contactors with suffix-specific coil voltages. The Eaton 6702ED584 and Ross Hill 0100-0389-02 share a headline rating and are not the same part.
6702ED584 · 6702ED587-2 · 0100-0389-02View SCR bay contactors → Drawworks brakingDynamic Braking & Resistor Banks
NOV dynamic brake resistor banks and Ross Hill DWDB grid resistor assemblies. They are different equipment and should be identified from the unit label.
10509209-001 · 0100-1000-04View braking equipment → Generator controlsGenerator Excitation & AutoSync
Generator exciter PCBs, AutoSync AC II modules, and synchronizing transformers that keep generator sets sharing the bus and locking in.
0509-7901 · 0000-8500-18 · 1004-0004-00View AutoSync AC II → Operator controlsDriller's Consoles & Control Assemblies
Console PCBs, power-limit cards, handwheels, dual rheostats, and foot throttles that turn operator input into drive command.
0509-2500 · 0509-7497 · 0001-1467-38View console and field controls →Everything electrical that keeps an AC rig operating
AC-powered rigs demand more than a replacement drive. We source the VFD power sections, control boards, operator interfaces, motor and feedback hardware, line-side distribution, braking, cooling, PLC and I/O, switchgear, MCC, protection, and instrumentation used across super-spec rig systems. Our standard is fast, accurate identification and high-quality, condition-disclosed equipment that helps crews shorten downtime without guessing at the part.
AC drives and VFD systems for super-spec equipment
Low- and medium-voltage drives for drawworks, mud pumps, top drives, rotary systems, and rig auxiliaries. We source current and obsolete drive frames, power and control boards, I/O, operator interfaces, cooling, braking, and retrofit hardware across Allen-Bradley PowerFlex, ABB ACS, Siemens SINAMICS, Yaskawa, Eaton, Danfoss, and Schneider Altivar.
VFD Power, Control & Cooling
Power boards, control boards, gate drivers, I/O, operator interfaces, fans, braking components, and retrofit hardware.
View drive hardware →Soft Starters & AC Motor Control
Soft starters, contactors, overloads, starters, and control hardware for pumps, fans, motors, and rig auxiliaries.
View motor control →Switchgear, MCC & Protection
MCC buckets, breakers, protective relays, switchgear parts, bus, and metering for rig power distribution.
View MCC and protection →AC Motors, Feedback & Output Hardware
AC drilling motors, encoder and feedback hardware, output reactors, sine-wave filters, motor cooling, and the drive-to-motor components used in VFD rig systems.
View AC drive equipment →AC Rig Controls & Instrumentation
PLCs, remote I/O, operator stations, drive-interface modules, network hardware, meters, relays, and instrumentation used to command and monitor AC rig equipment.
View AC rig controls →Transformers, Disconnects & Distribution
Control and distribution transformers, disconnects, bus plugs, panel hardware, and the electrical pieces around the drive system.
View distribution equipment →More than a parts supplier
Custom Fabrication & Enclosures
Want to upgrade equipment in a legacy SCR system? Ask our sales team about retrofit options for AC or DC equipment. Edmundson Industrial provides custom enclosures, panels, mounting hardware, and application-specific assemblies for customers who want to replace unsupported equipment without the headache of a full system replacement. In drilling, downtime does not wait, and the schedule does not accept excuses.
Explore fabrication & retrofitsNames we source and cross-reference across the rig
System builders, rotating equipment, controls, power semiconductors, protection, and instrumentation represented in EI's rig-electrical cross-reference structure.
Rig house builders & drive-system names
Generators, motors & rotating equipment
Drives, controls, protection & instrumentation
Manufacturer and system names are used for identification and reference only. Edmundson Industrial is an independent supplier. Listing a name does not imply authorization, current stock, or interchangeability; every request is checked against the complete installed label.
Built for when something's down
Highest quality products and solutions
Real product knowledge
Fast results, every time.
Looking for a specific part?
Send us the manufacturer and part number and we'll tell you what we can find.