Oilfield electrical runs on equipment that was built decades ago: and the OEMs behind it have changed, merged, or disappeared entirely. Edmundson Industrial supplies, sources, and builds for the oilfield: SCR house components, Ross Hill Controls parts, NOV and Canrig electrical, drawworks drives, mud pump starters, and custom VFD and SCR house fabrication.
Drilling rigs were designed to run for decades, and the electrical systems on them reflect that. SCR houses, drawworks drives, mud pump motor controls, and topside electrical infrastructure were engineered for long service lives. But the companies that built them (Ross Hill Controls, older National Oilwell divisions, legacy SCR manufacturers) have been acquired, restructured, or discontinued their support programs.
Standard industrial distribution isn't built for oilfield work. Distributors don't stock SCR components, don't understand rig electrical architecture, and can't help when a rig-down situation requires urgent response. That's where Edmundson Industrial comes in. We know the equipment, we know the part numbers, and we maintain supply channels for the electrical components that keep rigs running.
Whether you need a replacement drive module for a Ross Hill SCR, motor control components for a mud pump, or a complete custom VFD house built to your spec, send us what you have and we'll respond with options.
Edmundson Industrial handles a broad range of oilfield electrical requirements, from individual replacement components to complete drive systems and fabricated assemblies.
Silicon Controlled Rectifier systems power the DC drive equipment on conventional drilling rigs. We source components across legacy and current SCR architectures.
Motor control for the primary rig loads, drawworks hoisting, mud pump drives, and rotary table systems. DC and AC architectures.
Top drive control systems from National Oilwell Varco, Canrig, and legacy manufacturers. Drive electronics, control panels, and field replacement components.
Electrical distribution, motor control centers, and switchgear for rig power systems, both legacy DC rig configurations and modern AC rig architectures.
Ross Hill Controls defined the SCR-based DC drive architecture that powered a generation of drilling rigs. Their drive systems, control consoles, and motor control equipment became the standard configuration for land rigs and offshore platforms throughout the industry's most active decades.
The challenge today is that Ross Hill's product line went through multiple ownership transitions. Support and parts availability through standard channels is inconsistent at best. When a rig running Ross Hill equipment goes down, finding genuine replacement parts or compatible substitutes requires oilfield-specific sourcing experience.
Edmundson Industrial maintains supply channels for Ross Hill Controls components. If you have a part number, a model number, or a description of what failed . Send it to us. We'll check availability across surplus, reconditioned, and new-old-stock inventory and respond with what we can locate.
These are the Ross Hill Controls components we receive requests for most frequently. If your part isn't listed, send us the part number, we'll check availability.
Send us the Ross Hill part number, model designation, or a description of the failed component. Photos of nameplates and the board or module itself help us confirm compatibility. We respond with availability and pricing as quickly as possible.
When a rig's power conversion infrastructure reaches end of life, or when an operator is transitioning from DC to AC drive architecture, complete house replacement or rebuild is often the most economical path. Edmundson Industrial builds custom SCR houses and VFD houses to customer specification.
This isn't off-the-shelf product, it's fabricated to match your rig's footprint, power requirements, and interface specifications. We work from your documentation, from field measurements, or from the existing unit when a like-for-like replacement is the goal.
A complete VFD house for rig application is a fabricated assembly, not a product you order from a catalog. The scope typically includes enclosure construction, bus work, VFD installation and wiring, control system integration, and testing before delivery.
Oilfield parts requests work differently from standard industrial orders. The more information you can provide, the faster and more accurately we can respond. Here's what helps.
Ross Hill Controls, NOV, Canrig, and legacy SCR manufacturers used consistent part numbering. If you have the part number (from the nameplate, the manual, or a previous order) that's the most direct path to a fast quote.
For components where the part number is worn or missing, a clear photo of the nameplate (or photos of the unit itself, the PCB, or the enclosure label) gives us what we need to identify the component and locate compatible replacements.
If you have the original equipment manual, wiring diagrams, or parts lists for the rig system (even partial documentation) include it with your request. This helps us confirm exact replacements and identify compatible alternatives when OEM parts aren't available.
Tell us what rig the parts are for, what failed, and how urgent the situation is. Rig-down situations get priority response. If you have a commissioning or maintenance window with a hard deadline, let us know, we'll work backward from your date.
Use the RFQ form or email directly. Either works, include as much detail as you have. We respond as quickly as possible, with priority turnaround for rig-down situations.
Oilfield electrical spans legacy and current manufacturers across drive systems, controls, and distribution. These are the brands and product lines we handle most frequently.