Baldor CM3556 Electric Motor

Baldor CM3556 Electric Motor 1HP, 208-230/460V, 1155RPM, 3-Phase, 56C Frame – New

The Baldor-Reliance CM3556 (Spec: 35A012N025G1) is a 6-pole squirrel-cage induction motor engineered for fixed-mount flange configurations. Operating at a nominal full-load base speed of 1155 RPM on a 60 Hz line, this unit delivers high torque-density output suitable for low-speed mechanical drives, reciprocating assemblies, positive-displacement pumps, and maritime deck machinery.

Built on a rigid NEMA 56C frame, the motor utilizes a Totally Enclosed Fan Cooled (TEFC) architecture. This design isolates internal windings, rotors, and stator laminations from ambient particulates, oil mists, moisture ingress, and corrosive sea-air environments. Designed for continuous duty (S1), it features Class B insulation, a 1.15 service factor, and dual-voltage 9-lead terminal capability (208–230V / 460V AC). This configuration enables clean integration into both US domestic industrial grids and 440–480V marine/offshore distribution switchboards.

Model Details

• Manufacturer: Baldor Electric Company / Baldor-Reliance (ABB)
• Model / Catalog Number: CM3556
• Spec Number: 35A012N025G1
• Motor Type: 3520M
• Manufacturer Part Number (MPN): CM3556
• Condition: New

Key Features

1. 6-Pole High-Torque 1155 RPM Output: Low synchronous speed (1200 RPM nominal) reduces intermediate gear reduction stages on positive displacement pumps, augers, and deck winches.
2. TEFC Severe Duty Ingress Protection: Enclosed fan-cooled design prevents salt mist, dust, chemical vapors, and spray water from contacting internal electrical windings.
3. Machined NEMA 56C Face Mount: Standardized C-face registers allow direct close-coupling to hydraulic power units, centrifugal pumps, and C-flange inline speed reducers without alignment brackets.
4. Dual-Voltage 9-Lead Stator (208-230/460V): Compatible with low-voltage Delta/Star configurations, easing standard industrial (230V) and marine/commercial (460V) installations.
5. 1.15 Service Factor Thermal Reserve: Provides 15% sustained overload capacity to withstand voltage sags, harmonic distortions, or heavy duty-cycle current spikes.

Part Number Cross-References

• Direct Successor (NEMA Premium): Baldor CEM3556 (Spec 3526M, 143TC/56C, Class F)
• Footed / Alternative Mounting Equivalents: Baldor M3556 (Base Mount), Baldor CEM3556T (143TC Frame)
• Alternative Manufacturer Equivalents:
  • Marathon Electric: 56T11F5323 / C182
  • Leeson: 111948.00 / C6T11FC1D
  • WEG: 00112ET3E56C-S
  • US Motors / Nidec: U1P3DFC / FM72

Technical Details

Frequently Asked Questions

Can the Baldor CM3556 run on a Variable Frequency Drive (VFD)?

Yes, it can run on an inverter duty cycle under variable torque loads (such as centrifugal fans and pumps). However, because the unit utilizes Class B insulation and standard magnet wire, you should limit inverter carrier frequency to 4 kHz or lower and install a load reactor if motor cable leads exceed 50 feet (15 meters) to prevent reflected voltage wave spikes.

What is the difference between CM3556 and CEM3556?

The CM3556 is a standard-efficiency motor (78.5% efficiency, Class B insulation), whereas the CEM3556 is a newer NEMA Premium Efficiency equivalent (82.5% efficiency, Class F insulation, 1170 RPM). The C-face mounting dimensions and shaft centerlines remain mechanically interchangeable.

Does this motor come with mounting feet?

No, the CM3556 is a dedicated C-face round-body motor designed for flange-face direct mounting via the front pilot register and 4-bolt bolt pattern. If you need rigid base mounting, you will need a 56C bolt-on foot kit or a base-mounted unit like the M3556.

Can this motor operate on 50 Hz power grids?

When operating on 50 Hz grids (such as 190/380V), induction motors derate in speed and horsepower proportional to frequency. At 50 Hz, nominal synchronous speed drops to 1000 RPM (running speed ~960 RPM), and rated power outputs reduce to approximately 0.75 HP.