503-4417 450-9619 EMCP 4.4 Generator Set Monitor Display Panel for Caterpillar G3520
503-4417 / 450-9619 EMCP 4.4 monitor display panel, fits for Caterpillar generator sets, gas sets, petroleum packages and energy storage systems.
- Interchangeability: 503-4417 / 450-9619 / 350-7076 / 351-2430 / 20R-8825
- Application: C9–C175-20, DG350–DG500, G3306B–G3520E, XQ & XQP, TH31/TH35 packages, PGS & ETS storage
- Programming Required: Panel must be configured to your set — send us your original part number and nameplate photo after purchase
- Verify Before Ordering: EMCP 4.2, 4.3 and 4.4 panels are not interchangeable — read the label on the rear of your current panel first
$4,999.00
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Bench-Tested - Every unit powered up and function-tested before dispatch.
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6-Month Warranty - From delivery, against defects in materials and workmanship.
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30-Day Returns - Unused items in original packaging. RMA required.
Product Details
This EMCP 4.4 generator set monitor display panel is a new aftermarket replacement for part numbers 503-4417, 450-9619, 350-7076, 351-2430 and 20R-8825, covering the widest application range in the EMCP 4 family — diesel and gas generator sets, petroleum packages, power modules and energy storage systems.
The EMCP 4.4 is the top of the EMCP 4 range and carries the most extensive monitoring, protection and communication capability of the family. That is why it turns up not only on conventional prime power and standby sets but on paralleled installations, petroleum packages and battery energy storage systems, where the panel has to handle grid interaction and multi-source coordination rather than simply running one engine. On any of these the panel is a single point of failure: engine and AC parameters, protection logic, alarm annunciation, control and event logging all pass through it.
- Direct replacement fitment — matches the original panel cut-out, mounting pattern and harness connectors, so no enclosure modification or rewiring is needed.
- New condition — supplied unused, in plain protective packaging without third-party branding.
- Energy storage and renewable coverage — the only panel in this family also used on ETS1500, PGS840, PGS1260 and PGS1260 HD storage systems and the BDP250 renewable unit.
- Petroleum package coverage — TH31-C9I, TH31-C9P, TH35-C11I, TH35-C13I and TH35-C15I well service packages.
- Full diesel and gas genset range — C9 through C175-20, DG350 to DG500, G3306B through G3520E, plus XQ and XQP mobile power and the 3400 and 3500 series.
- Five-number interchange group — cross-references 503-4417, 450-9619, 350-7076, 351-2430 and 20R-8825.
- Function-restoring only — supplied to restore original operating parameters; no changes are made to protection settings or calibration.
- 6-month warranty — repair or replacement service if any fault appears within the period.
Important: Programming Is Required Before Use
This panel is not plug-and-play. Every installation carries its own configuration — engine or storage system type, alternator rating, voltage and frequency, CT ratios, protection thresholds, paralleling parameters and alarm setpoints — and the panel must be programmed to match by a qualified technician using approved service software before it will operate correctly. On paralleled sets and energy storage systems this is critical: an incorrectly configured panel can allow out-of-sync closure or defeat protection functions.
Please send us the following after purchase:
- The part number of your original monitor, plus a clear photograph of it
- A clear photograph of the machine nameplate (VIN plate)
We use these to confirm the correct panel generation and configuration for your installation.
Installation and removal of a generator set control panel should always be carried out by an experienced technician. Isolate the installation from all power sources, including battery, mains, shore supply and, on storage systems, the DC bus, before any work begins.
Fitment & OEM Interchange
The following reference numbers are listed for cross-reference and identification purposes only. All trademarks belong to their respective owners.
| Primary Reference Number | 503-4417 / 5034417 |
| Interchange Numbers | 450-9619 / 4509619 | 350-7076 / 3507076 | 351-2430 / 3512430 |
| Additional Cross-Reference | 20R-8825 / 20R8825 |
| Panel Generation | EMCP 4.4 (also referenced as EMCP4.4 U) |
| Condition | New — unused, plain protective packaging |
| Installation | Direct replacement — programming required |
EMCP 4.4 Is Not Interchangeable With 4.2, 4.2B or 4.3
The EMCP 4 family covers several panel generations that look broadly similar but differ in display, feature set, available inputs and communication capability. A 4.4 will not simply drop into a set specified for a lower generation, and a lower generation will not cover a 4.4 installation’s paralleling or storage functions. Read the part number on the label at the rear of your existing panel and send it to us together with a photograph of the machine nameplate — we will confirm the correct generation before you order.
Application Chart — Compatible with Caterpillar Equipment
| Category | Models |
|---|---|
| Control Panel | EMCP4.4 U |
| Generator | SR4, SR4B, SR4BHV, XQ330, XQP500 |
| Generator Set — C Series | C9, C13, C15, C15 I6, C18, C18 I6, C27, C32, C175-16, C175-20 |
| Generator Set — CG / D / DG Series | CG137-08, CG137-12, D1500, DG350, DG400, DG450, DG500 |
| Generator Set — Gas (G Series) | G3306B, G3412, G3512, G3512E, G3516, G3516B, G3516C, G3516E, G3520, G3520C, G3520E |
| Generator Set — XQ / XQP Series | XQ230, XQ375, XQ425, XQ1140, XQP300 |
| Generator Set — 3400 / 3500 Series | 3412, 3512, 3512B, 3512C, 3516, 3516B, 3516C, 3516E |
| Energy Storage | ETS1500, PGS840, PGS1260, PGS1260 HD |
| Renewable Energy | BDP250 |
| Petroleum Package | TH31-C9I, TH31-C9P, TH35-C11I, TH35-C13I, TH35-C15I |
| Petroleum Engine | 2016, 3508C, 3512B, 3512C, 3512E, 3516C |
| Petroleum Generator Set | 3512B, 3512C, G3306B |
| Power Module | C32, XQG135, XQ2280 |
| Engine | 3512E, G3520 |
| Gas Engine | G3512E, G3512H, G3516C, G3516E |
| Gen Set Engine | G3520 |
| Industrial Engine | 3512B, 3512C, 3516B |
| Excavator | 312 GC, 312 GX |
Before ordering: this panel spans diesel, gas and petroleum installations as well as battery energy storage, and configuration differs substantially across those application types. Compare the label on the rear of your existing panel against the reference numbers above, and if your number does not appear here, send us a photo along with your machine nameplate and we will confirm fitment for you.
Technical Specifications
| Part Name | Generator set monitor display panel (EMCP 4.4) |
| Reference Numbers | 503-4417, 450-9619, 350-7076, 351-2430, 20R-8825 |
| Condition | New — unused, supplied in plain protective packaging |
| Installation Method | Direct replacement — original cut-out and connectors |
| Programming | Required — must be configured to your installation |
| Function | Engine and AC parameter display, generator protection, paralleling support, alarm annunciation, control keypad, event logging |
| Application Types Covered | Diesel, gas and petroleum installations plus battery energy storage — configuration differs by type |
| System Voltage | 12V / 24V DC — application dependent, confirm against your installation |
| Mounting | Panel mount, original cut-out and fixing pattern |
| Connectors | Original harness connectors and pin layout |
| Environmental Design | Sealed front face, intended for enclosure heat, humidity and vibration |
| Testing | Powered up and function-tested before dispatch |
| Warranty | 6 months — repair or replacement service |
| Package Contents | 1 x monitor display panel (mounting hardware and harness not included) |
Where a specification is application dependent, confirm it against your own installation before ordering. This panel is supplied to restore original operating parameters only; protection setpoints, CT ratios, paralleling parameters and shutdown thresholds must be configured to your installation’s own specification.
Common Failure Symptoms
Control panels usually degrade in stages rather than failing outright. These are the patterns reported most often on paralleled, prime power and energy storage installations, and what each one typically points to.
| Symptom | What It Usually Points To |
|---|---|
| Set will not start from the panel | Failed start output or control logic. Confirm the emergency stop is reset and check the manual start path before condemning the panel. |
| Sets will not synchronise or share load | Paralleling function or breaker control fault. Check the sync check inputs and the link between panels before replacing — this can also be a configuration mismatch rather than a hardware failure. |
| Storage system will not transfer or dispatch | Control or communication stage failure on the storage-side interface. Verify the DC bus and inverter status independently before assuming the panel is at fault. |
| Screen dark but the set runs | Backlight or internal supply failure. Check panel supply voltage and the harness connector first. |
| Loss of remote monitoring or SCADA link | Communication module or port failure — significant on unattended prime power and storage sites monitored remotely. |
| AC metering or power factor values wrong | Failed voltage or current input stage, or an incorrect CT ratio setting. On paralleled sets this also disrupts load sharing. |
| Nuisance shutdowns with no real fault | The panel acting on corrupted sensor input, or a failing protection stage. Cross-check the reported parameter against a gauge before accepting it. |
| Alarms never annunciate | Alarm output stage failure — the most serious mode, since the installation appears monitored but protection is silently lost. |
| Panel freezes and needs a power cycle | Processor lock-up, often heat related inside a sealed enclosure. A shortening interval between lock-ups means the panel is on its way out. |
| Configuration or event log lost after isolation | Failed internal memory retention. The installation may still run but needs reconfiguring after every isolation, which is not sustainable. |
Check the supply side and the configuration first. Battery condition, charger output, panel fuse, ground integrity and corroded harness pins imitate panel failure far more often than the panel itself. On paralleled and storage installations, a surprising share of suspected panel faults turn out to be configuration mismatches introduced during a previous service visit — compare settings against a known-good sibling panel before ordering a replacement.
Shipping & Quality Guarantee
- 100% quality control — every panel is powered up and function-tested before it leaves our facility.
- Dispatch in 1–3 business days via DHL, UPS or FedEx express, with tracking provided within 24–48 hours.
- Protective packaging — anti-static wrap and foam-cushioned carton, sealed against moisture for international transit.
- 6-month warranty — if a fault arises within the period, we provide repair or replacement service.
- Fitment support — send us your original panel part number with a photo of the machine nameplate and we will confirm the correct generation before and after purchase.
Shipping & Customs Notice
The listed price covers the product, shipping and handling only. It does not include import duty, VAT, GST or any local taxes or customs clearance charges. Any such fees are levied by your national customs authority and remain the buyer’s responsibility. Please check your local import regulations before ordering.
All brand names, part numbers and model designations are used for identification and cross-reference purposes only. We are an independent parts supplier and are not affiliated with, authorised by or endorsed by any vehicle, engine or equipment manufacturer. All trademarks are the property of their respective owners.
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