503-4406 20R-9456 EMCP 4.3 Panel for CAT Generator Set Monitor | LIUCHUANG
503-4406 / 450-9609 EMCP 4.3 monitor display panel, fits for Caterpillar SR4 generators and C-series, G-series gas and 3500 series generator sets.
- Interchangeability: 503-4406 / 5034406 / 450-9609 / 4509609 / 20R-9456
- Application: C9–C175-20, DG350–DG500, G3412–G3520H gas sets, 3412, 3500 series, XQC1200 & XQC1600
- 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, 4.2B and 4.3 panels are not interchangeable — read the label on the rear of your current panel first
$3,999.00
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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 4.3 generator set monitor display panel is a new aftermarket replacement for part numbers 503-4406, 450-9609 and 20R-9456, fitted as a direct replacement across SR4 generators, C9 to C175-20 sets, the DG350 to DG500 range, G-series gas sets from G3412 to G3520H, and the 3500 series.
The EMCP 4.3 sits at the upper end of the EMCP 4 family and is typically found on larger and more heavily instrumented installations — gas generation, prime power and large standby sets where the panel carries extended monitoring, generator protection and communication functions. On these installations the panel is a single point of failure: engine parameters, AC metering, protection logic, alarm annunciation, start and stop control and event logging all pass through it, so when it dies the set generally cannot be run or monitored at all.
- 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.
- Strong gas generation coverage — G3412, G3512, G3512E, G3512H, G3516 through G3516H, G3520, G3520C, G3520E and G3520H, plus CG137-12.
- Large power installation coverage — C175-16 and C175-20 sets, DG350 to DG500, and XQC1200 and XQC1600 power modules.
- Three-number interchange group — cross-references 503-4406, 450-9609 and 20R-9456 in hyphenated and plain forms.
- Full control and monitoring interface — engine and AC parameter display, generator protection, alarm annunciation, control keypad and event log.
- 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 generator set carries its own configuration — engine family, alternator rating, voltage and frequency, CT ratios, protection thresholds and alarm setpoints — and the panel must be programmed to match your set by a qualified technician using approved service software before it will operate correctly. On gas sets this matters even more, since combustion and load control parameters differ substantially from diesel equivalents.
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 set.
Installation and removal of a generator set control panel should always be carried out by an experienced technician. Isolate the set from all power sources, including battery, mains and shore supply, 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 | 503-4406 / 5034406 |
| Interchange Number | 450-9609 / 4509609 |
| Additional Cross-Reference | 20R-9456 / 20R9456 |
| Panel Generation | EMCP 4.3 |
| Condition | New — unused, plain protective packaging |
| Installation | Direct replacement — programming required |
EMCP 4.3 Is Not Interchangeable With 4.2 or 4.2B
The EMCP 4 family covers several panel generations that look broadly similar but differ in display, feature set, available inputs and communication capability. A 4.3 will not simply drop into a set specified for 4.2 or 4.2B, and vice versa. 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 |
|---|---|
| Generator | SR4, SR4B, SR4BHV |
| Generator Set — C Series | C9, C15, C15 I6, C18, C18 I6, C27, C32, C175-16, C175-20 |
| Generator Set — D / DG Series | D1500, DG350, DG400, DG450, DG500 |
| Generator Set — Gas (G / CG Series) | G3412, G3512, G3512E, G3516, G3516B, G3516C, G3516E, G3516H, G3520, G3520C, G3520E, G3520H, CG137-12 |
| Generator Set — 3400 / 3500 Series | 3412, 3512, 3512B, 3512C, 3516, 3516B, 3516C, 3516E |
| Engine | G3516C, G3516H, G3520, G3520H |
| Gas Engine | G3512E, G3512H, G3516C, G3516E |
| Gen Set Engine | G3516C, G3520 |
| Industrial Engine | 3512B, 3512C, 3561B |
| Petroleum Engine | 3512C, 3512E |
| Petroleum Generator Set | 3512B, 3512C |
| Power Module | 3516B, XQC1200, XQC1600 |
Before ordering: this panel spans diesel, gas and petroleum installations from C9 sets up to C175-20 and G3520H machines, and configuration varies considerably across that range. 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 4.3) |
| Reference Numbers | 503-4406, 450-9609, 20R-9456 |
| Condition | New — unused, supplied in plain protective packaging |
| Installation Method | Direct replacement — original cut-out and connectors |
| Programming | Required — must be configured to your generator set |
| Function | Engine and AC parameter display, generator protection, alarm annunciation, control keypad, event logging |
| Fuel Types Covered | Diesel, gas and petroleum applications — configuration differs by fuel type |
| System Voltage | 12V / 24V DC — application dependent, confirm against your set |
| Mounting | Panel mount, original cut-out and fixing pattern |
| Connectors | Original harness connectors and pin layout |
| Environmental Design | Sealed front face, intended for genset 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 and shutdown thresholds must be configured to your set’s own specification.
Common Failure Symptoms
Control panels usually degrade in stages rather than failing outright. These are the patterns reported most often on prime power and gas generation 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. |
| 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 — a significant issue on prime power sites where the set is monitored remotely rather than attended. |
| 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. |
| 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. |
| Alarms never annunciate | Alarm output stage failure — the most serious mode, since the set 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. |
| Keypad buttons unresponsive | Worn membrane keypad — the most common wear item on frequently operated sets, and often the first symptom to appear. |
| Configuration or event log lost after isolation | Failed internal memory retention. The set may still run but needs reconfiguring after every battery disconnect, which is not sustainable. |
Check the supply side first. Battery condition, charger output, panel fuse, ground integrity and corroded harness pins imitate panel failure far more often than the panel itself. On standby sets that sit idle for long periods, a weak or sulphated battery is by far the most common cause of a panel that appears dead.
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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