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                                                                                    GE CR2940NH201B Heavy-Duty Auxiliary Contact Block

                                                                                    1. Product Overview

                                                                                    Manufacturer: General Electric Industrial Control

                                                                                     

                                                                                    Model: CR2940NH201B

                                                                                     

                                                                                    Series: CR2940 heavy-duty oil-tight control contact block system

                                                                                     

                                                                                    This item is an auxiliary contact block rather than a main power contactor. It works with GE CR2940 series pushbuttons and selector switches to achieve control signal interlock, fault feedback and signal switching for PLC inputs.

                                                                                    Model code explanation

                                                                                     

                                                                                    CR2940 stands for GE heavy-duty control switch and contact block series. NH represents oil-tight and dustproof sealed industrial structure. 201 means the contact configuration includes one normally open contact and one normally closed contact. B refers to standard mounting base matching 30mm CR2940 operation heads.

                                                                                    2. Core Electrical Ratings

                                                                                    Contact capacity

                                                                                     

                                                                                    Maximum rated voltage reaches 600 VAC and 600 VDC. It meets A600 AC control and P600 DC utilization standards. Continuous thermal current is 10 A.

                                                                                     

                                                                                    Breaking capacity: AC-15 load can handle 720 VA inductive loads under 600 VAC; DC-13 load supports 72 W inductive coils under 600 VDC. The minimum switching load is 5 mA at 24 VDC, ensuring stable low-current signal transmission to PLC modules.

                                                                                    Insulation and dielectric performance

                                                                                     

                                                                                    Insulation resistance is higher than 100 MΩ. It can withstand 2000 VAC voltage for 1 minute between contacts and ground.

                                                                                     

                                                                                    Mechanical service life hits 10 million operations, while electrical service life reaches 1 million cycles under full inductive rated load.

                                                                                    3. Mechanical & Environmental Specifications

                                                                                    Structure and mounting

                                                                                     

                                                                                    Equipped with silver alloy contacts consisting of 1NO and 1NC sets. It fits standard 30mm round mounting holes for CR2940 series operation heads. Screw terminals accept copper wires from 14 AWG to 22 AWG.

                                                                                     

                                                                                    The NH oil-tight sealed structure resists dust, moisture, oil mist and cutting fluid, reaching IP65 front panel protection when assembled with matching operation heads.

                                                                                    Ambient working conditions

                                                                                     

                                                                                    Operating temperature ranges from -20°C to +65°C, storage temperature ranges from -40°C to +85°C, applicable under 5%–95% non-condensing humidity.

                                                                                     

                                                                                    Certified by UL and CSA, compliant with NEMA industrial standards.

                                                                                    4. Compatible Matching Components

                                                                                    CR2940 series pushbuttons, selector switches and indicator light operation heads; NEMA 4/4X oil-proof industrial control stations.

                                                                                     

                                                                                    Applicable loads include PLC digital input modules, relay coils, indicator lamps and solenoid valve control circuits. Supporting accessories contain mechanical interlock modules and multi-contact stacking adapters.

                                                                                    5. Main Functions

                                                                                    Convert mechanical actions of pushbuttons and selector switches into independent NO and NC electrical control signals.

                                                                                     

                                                                                    Transmit equipment start-stop state, position and fault feedback signals to PLC, DCS and HMI systems.

                                                                                     

                                                                                    Build interlock logic circuits for motor starters, valve control and safety shutdown loops.

                                                                                     

                                                                                    Dual contact design enables simultaneous running status indication and safety interlock with one single block.

                                                                                    6. Key Advantages

                                                                                    Oil-tight sealed housing adapts to machine tool and metal processing workshops filled with coolant and oil mist.

                                                                                     

                                                                                    Integrated 1NO+1NC contact layout realizes status display and interlock protection at the same time, saving installation space.

                                                                                     

                                                                                    Silver alloy contacts avoid oxidation and guarantee reliable switching of tiny low-current signals.

                                                                                     

                                                                                    Wide 600V voltage range fits all global industrial AC and DC control circuits.

                                                                                     

                                                                                    Ultra-long mechanical and electrical service life supports frequent switching on production sites.

                                                                                     
                                                                                     

The structure and details of the product：