Mitsubishi CM300HA-24H Replacement for CM-HA Series

Product Overview

Mitsubishi CM300HA-24H Replacement for CM-HA Series: Smooth Transition & Legacy System Compatibility

The Mitsubishi CM300HA-24H is a 600V, 300A IGBT Power Module from the CM-HA Series, widely deployed in industrial inverter drives, servo amplifiers, UPS systems, induction heating equipment, and high-power motor control panels. As original production of this module has been discontinued or supply has become constrained, many facilities operating legacy drive systems — including older Mitsubishi FR-A500, FR-A700, and FR-F700 series inverters — face urgent replacement decisions to maintain uptime and production continuity.

TOPNLMS supplies verified CM300HA-24H modules sourced from authorized distribution channels and tested against original Mitsubishi Electric specifications. Each unit undergoes pre-shipment functional verification to ensure it meets the original gate threshold voltage, collector-emitter saturation voltage (VCE(sat)), and thermal resistance parameters required for reliable operation in your existing control cabinet.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful CM300HA-24H replacement is rarely a standalone task. In most industrial retrofit scenarios, the module sits within a broader drive or power conversion system where several surrounding components must be evaluated simultaneously to ensure a reliable, long-term outcome.

When replacing the CM300HA-24H in a Mitsubishi FR-A700 or FR-F700 series inverter, engineers typically inspect the gate driver board (commonly the M57962L or M57959L driver IC module) for signs of degradation, since a failed IGBT often stresses the gate circuit. If the driver board shows burn marks or erratic gate signal output, it should be replaced alongside the power module to prevent repeat failures.

The DC bus capacitor bank within the inverter’s power stage is another critical component. Electrolytic capacitors in high-power drives have a finite service life, and a capacitor that has been operating near a failed IGBT may have experienced voltage spikes. Inspecting and, where necessary, replacing the DC link capacitors during the same maintenance window reduces the risk of a secondary failure shortly after the IGBT swap.

For systems using a Mitsubishi FR-A500 series inverter — an older platform that the CM300HA-24H was commonly used in — the control board (FR-A5NC or FR-A5AP option cards) and the main control PCB should be checked for firmware compatibility and physical condition. While the power module replacement itself does not require any software changes, this is an ideal time to audit the control architecture and consider whether a full inverter upgrade to the FR-A800 or FR-F800 platform is warranted for long-term supportability.

In applications where the CM300HA-24H drives a servo or spindle motor, the motor encoder feedback cable and the servo amplifier’s current sensing board should be verified. Current transducers and Hall-effect sensors in the amplifier can be damaged by the same fault conditions that destroy an IGBT module. Replacing the power module without checking these components may result in immediate overcurrent faults on first power-up.

For facilities managing a broader PLC-controlled drive system — for example, a Mitsubishi MELSEC Q-series or iQ-R series PLC communicating with the inverter via CC-Link or PROFIBUS — the replacement process should include a review of the inverter’s parameter settings stored in the PLC program. After a module swap and inverter re-initialization, some drive parameters (acceleration/deceleration ramps, torque limits, carrier frequency) may revert to factory defaults. Uploading the backed-up parameter file from the PLC or from a GOT2000 series HMI before returning the system to production is essential.

Where the control cabinet includes a Mitsubishi FR-E700 or FR-D700 compact inverter in an adjacent axis, this is a good opportunity to audit those units as well, since they share the same maintenance cycle and are often sourced together. Similarly, terminal block assemblies (such as Mitsubishi’s TB series or equivalent DIN-rail terminal modules) connecting the inverter output to the motor should be inspected for heat discoloration or loose connections that may have contributed to the original module failure.

Finally, if the system uses a regenerative braking resistor or braking unit (such as the FR-BU2 or FR-BR series), verify that the braking chopper circuit is intact. A shorted braking IGBT can cause DC bus overvoltage that destroys the main power module — addressing this root cause before installing the replacement CM300HA-24H is critical to avoiding repeat failures.

Retrofit Guidance FAQ

Q: Is the CM300HA-24H a direct pin-compatible replacement for older CM-HA Series modules?
A: Yes. The CM300HA-24H uses the standard CM-HA package footprint. Mounting hole positions, terminal layout, and module height are consistent with the series, allowing direct mechanical substitution without chassis modification.

Q: Do I need to update PLC programs or inverter firmware after replacing the module?
A: No firmware or PLC program changes are required for the power module swap itself. However, if the inverter control board was also replaced or reset, re-upload your saved parameter file before restarting production.

Q: What thermal interface material should I use during installation?
A: Remove all old thermal compound from the heatsink surface and module base. Apply a thin, even layer of high-performance thermal grease (e.g., Shin-Etsu X-23 or equivalent) before mounting. Torque the module bolts to the manufacturer’s specified value to ensure uniform contact pressure.

Q: Can this module be used in a system originally designed for a different CM-series rating?
A: The CM300HA-24H is rated for 600V/300A. Do not substitute it into a circuit designed for a higher voltage or current rating without a full engineering review. For higher-current applications, consult the CM400HA-24H or CM600HA-24H as potential alternatives.

Q: What communication protocols are supported?
A: The CM300HA-24H is a power stage component and does not implement any communication protocol. Protocol compatibility (CC-Link, PROFIBUS, Modbus, EtherNet/IP) is determined by the inverter’s option communication card, not the IGBT module.

Q: How do I verify the replacement module is functioning correctly before full production restart?
A: After installation, perform a no-load test at reduced speed (10–20 Hz) and monitor output current balance across all three phases using a clamp meter. Check for abnormal heat at the module base after 15–30 minutes of operation. Only proceed to full-load testing after the no-load test is satisfactory.

Warranty Assurance

Every CM300HA-24H supplied by TOPNLMS is covered by a 12-Month Warranty from the date of shipment. Our warranty process is straightforward: if the module exhibits a manufacturing defect or fails to meet its rated specifications under normal operating conditions within the warranty period, we will arrange a replacement or full refund — no lengthy dispute process.

Prior to shipment, each unit is subject to a pre-delivery inspection that includes visual examination for physical damage, verification of part markings and date codes, and basic electrical parameter checks. Modules that do not pass inspection are not shipped.

We ship from our Xiamen warehouse with DHL Express, FedEx International Priority, and sea freight options depending on order volume and urgency. Most in-stock orders are dispatched within 1–2 business days. For urgent plant-down situations, contact us directly for same-day dispatch arrangements.

Our after-sales team is reachable via email and phone for technical support during installation and commissioning. If you encounter any issue with the module after installation, document the fault condition (error codes, thermal images, oscilloscope captures of gate signals if available) and contact us — this information helps us resolve warranty claims quickly and accurately.

For volume procurement, OEM partnerships, or consignment stocking arrangements, please reach out to discuss pricing, lead times, and quality documentation (test reports, certificates of conformance).