Woodward CMW112 Current Monitoring Relay | Original & New Spare Parts

Woodward CMW112 Current Monitoring Relay – Industrial Process Solution

From the perspective of a seasoned Industrial Solution Architect, few components carry as much operational weight as a precision current monitoring relay in a live process control environment. The Woodward CMW112 serves as a critical protection node within Distributed Control System (DCS) architectures, motor control centers, and standalone protection panels — where its role is to continuously supervise AC current levels and trigger protective action before equipment damage occurs. In any facility where uptime is non-negotiable, the Woodward CMW112 is not merely a relay; it is the last line of defense against cascading electrical failures.

What distinguishes the CMW112 from generic alternatives is its engineered compatibility with legacy control infrastructure. Many plants running DCS Hardware from the 1990s and 2000s rely on relay form factors and signal interfaces that modern replacements cannot replicate without costly rewiring. The CMW112 slots directly into these environments — maintaining Fieldbus signal integrity and DIN rail footprint — making it the preferred choice for Legacy Components replacement programs where downtime budgets are measured in minutes, not hours.

Original stock of the CMW112 is increasingly scarce. As Woodward rationalizes its product portfolio, procurement teams are discovering that factory-sealed units are no longer available through standard distribution channels. Our inventory is sourced directly from authorized supply chains, inspected for authenticity, and held in climate-controlled storage — ensuring you receive a component that performs exactly as the original datasheet specifies.

Key Technical Highlights

Wide Measurement Range: 0.1A to 100A AC — covers light-load monitoring through heavy industrial motor circuits without range switching.
Dual Threshold Architecture: Independent high and low setpoints with separate SPDT relay outputs — enabling simultaneous overcurrent trip and undercurrent alarm from a single device.
Adjustable Time Delay: 0.1s to 30s programmable delay — eliminates nuisance trips during motor startup inrush while maintaining rapid fault response.
Universal Auxiliary Power: 24-240V AC/DC input — a single SKU covers the full voltage spectrum found across global industrial sites.
Redundancy-Ready Output Contacts: 2 SPDT rated at 5A @ 250V AC — suitable for direct PLC input, SCADA alarm, or hardwired shutdown interlock.
High Stability Design: ±2% measurement accuracy across the full operating temperature range of 20°C to +60°C — reliable in both arctic and tropical plant environments.
DIN Rail Mounting: Standard 35mm rail — zero panel modification required for retrofit into existing switchgear or MCC compartments.

Vertical Industry Applications

Petrochemical & Refining: In hydrocarbon processing plants, pump and compressor motors operate continuously under variable load. The CMW112 monitors current draw in real time; a sudden spike signals a blocked line or mechanical seizure, triggering shutdown before seal failure causes a process leak. Unplanned downtime in this sector can exceed $500,000 per hour — the CMW112 pays for itself in a single prevented incident.

Mining & Mineral Processing: Conveyor drives, crushers, and ball mills are subject to extreme mechanical stress. Undercurrent detection via the CMW112 identifies belt slip or empty-run conditions, while overcurrent protection guards against rotor lock. Integrating this relay into the site’s Process Control layer reduces mean time between failures and extends motor service intervals.

Marine & Offshore: Vessel electrical systems demand components rated for vibration, humidity, and wide temperature swings. The CMW112’s robust construction and IP20 front panel make it suitable for marine switchboards, where it monitors generator load sharing and auxiliary motor circuits — critical for maintaining propulsion and safety system availability at sea.

Power Generation & Utilities: Transformer secondary monitoring, generator excitation current supervision, and auxiliary motor protection in power stations all benefit from the CMW112’s dual-threshold capability. Its Factory Sealed Condition ensures dielectric integrity is preserved — essential in high-voltage environments where contamination is a safety risk.

Water & Wastewater Treatment: Submersible pump motors are vulnerable to dry-run damage when water levels drop unexpectedly. The CMW112’s undercurrent threshold detects the characteristic current drop of a cavitating or air-locked pump and initiates a controlled shutdown — protecting assets that are expensive and time-consuming to retrieve for repair.

Data Sheet & Specifications

Quality Assurance & Supply Chain

Every unit of the CMW112 we supply is 100% Original Woodward — sourced through verified industrial supply chains and never remanufactured, refurbished, or relabeled. Each relay is stored in its original Factory Sealed packaging, preserving the manufacturer’s quality assurance from production line to your panel.

Our 12-Month Comprehensive Warranty covers all defects in materials and workmanship from the date of delivery. Should a unit fail within the warranty period under normal operating conditions, we provide direct replacement without bureaucratic delay — because your plant cannot wait for warranty committee reviews.

For emergency procurement scenarios, we offer Express Delivery via DHL / FedEx / UPS to any global destination. Most in-stock orders ship within 24 hours of payment confirmation. We understand that a critical part for industry safety like the CMW112 is not a discretionary purchase — it is an operational necessity, and our logistics infrastructure is built around that reality.

Buyer’s FAQ — Selection Guide

Q1: How can I verify that the CMW112 I receive is a genuine Woodward original and not a counterfeit?
A: Authentic Woodward CMW112 units carry a manufacturer’s holographic label with a traceable batch code on the housing. The PCB inside will bear Woodward’s proprietary component markings. We provide a Certificate of Authenticity with every shipment, and our units can be cross-referenced against Woodward’s official part numbering system. If you have access to a known-good unit for comparison, the housing dimensions, label typography, and terminal block quality are immediately distinguishable from counterfeit copies.

Q2: Where can I obtain the official datasheet and wiring diagram for the CMW112?
A: The official Woodward CMW112 datasheet is available through Woodward’s technical documentation portal. When you place an order with us, we include a printed copy of the datasheet and wiring diagram in the shipment. Our technical team can also provide application notes for specific installation scenarios upon request via email.

Q3: Is the CMW112 compatible with older DCS systems and legacy control panels?
A: Yes. The CMW112 was designed during an era when DCS Hardware standardization was paramount. Its relay output interface (SPDT contacts) is universally compatible with any control system that accepts dry contact inputs — including legacy Honeywell, ABB, Emerson, and Yokogawa DCS platforms. No firmware updates, protocol converters, or signal conditioners are required.

Q4: What current transformer (CT) specifications are required for correct operation?
A: The CMW112 accepts CT secondary outputs of 1A or 5A. Select a CT whose primary rating matches your maximum expected load current. The relay’s internal scaling accommodates the CT ratio, so no external burden resistors are needed for standard installations. For high-accuracy applications, use a CT with accuracy class 0.5 or better.

Q5: Can the CMW112 be used in a three-phase motor protection scheme?
A: The CMW112 monitors a single current channel. For three-phase protection, deploy one unit per phase — a common practice in critical motor protection schemes where phase-specific fault detection is required. Alternatively, monitor the neutral or earth current for ground fault detection using a separate CT and CMW112 unit.

Q6: What is the lead time for emergency orders, and do you support partial shipments?
A: For in-stock units, emergency orders ship within 24 hours via DHL Express or FedEx Priority. For larger quantities, we support partial shipments — releasing available stock immediately while sourcing the balance — to minimize your plant’s exposure to unprotected equipment. Contact our team directly for emergency procurement coordination.

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