IMO Controls CT02C – Contact Block 2NO (B4TU20), 10A AC1 / 6A AC15, for IMO PB Series Pushbutton Enclosures

This is the IMO Controls CT02C – a Contact Block 2NO (B4TU20), 10A AC1 / 6A AC15, for IMO PB Series Pushbutton Enclosures available at SparksDirect for the best price. Purchase this item with confidence at Sparks today.

The IMO Controls CT02C is a contact block fitted with 2 Normally Open (N/O) contacts, part number B4TU20, designed for use within IMO's pushbutton enclosures. It is rated at 10A AC1 and 6A AC15, placing it squarely in the industrial control circuit category — it is not a heating or lighting contactor, nor a DIN rail device, and carries no coil or independent switching mechanism of its own. Instead, it is a rear-mounted contact block that clips into an IMO pushbutton or selector switch body, providing the electrical switching contacts that operate whenever the actuator is pressed or turned. The double Normally Open configuration means both contacts are open at rest and close together when the pushbutton is activated, making this the ideal choice where two separate circuits need to be made simultaneously from a single operator action. 

The CT02C carries IP65 ingress protection and is certified to UL and CSA standards, reflecting its suitability for use in industrial environments where dust and occasional water ingress are a concern. In assembled pushbutton stations, the CT02C is commonly specified for the "Start" button in a Stop/Start motor control arrangement, where activating the green start button must simultaneously close two circuits — typically one to energise the contactor coil and one to send a run signal to a PLC or indicator. It is compatible with IMO's wider PB and B3 series pushbutton and enclosure range and pairs with other contact blocks, pilot lights, and enclosure bodies from the same family. 

Technical Specifications

• Manufacturer Part Number: CT02C / B4TU20
• Contact Configuration: 2 × Normally Open (N/O)
• AC1 Current Rating: 10A
• AC15 Current Rating: 6A
• Maximum Contact Voltage (AC): 400–415V AC
• Terminal Type: Screw terminals
• Ingress Protection: IP65
• Housing Material: Plastic
• Mounting Type: Rear mounting (inside pushbutton enclosure body)
• Compatibility: IMO PB pushbutton range; IMO B3 Series pushbutton switches
• Standards: UL, CSA certified; IEC 60947-5-1 compliant
• RoHS Compliant: Yes

What Do People Want to Know?

Q: What is the difference between the CT02C (2NO) and the CT01C (1NO+1NC), and when should I use each?

The CT02C provides two independent Normally Open contacts that both close when the button is pressed, making it the right choice where a single button press must simultaneously trigger two separate circuits — for example, sending a "run" command to a contactor coil while also signalling a PLC input or illuminating a pilot lamp. The CT01C, by contrast, provides one NO and one NC contact and is typically used in stop/start arrangements where one contact activates a function and the other simultaneously breaks an interlock or indicator circuit. The CT02C is most often seen on "Start" buttons; the CT01C on general-purpose or interlocked control buttons. 

Q: Can the CT02C be used with selector switches as well as pushbuttons?

Yes — the B4TU20 contact block format used by the CT02C is compatible with the broader IMO pushbutton and selector switch range. It is designed for use with IMO pushbuttons and selector switches in control circuits, which means it can sit behind a rotary selector switch body just as easily as a momentary pushbutton actuator. This makes it useful in multi-position selector switch assemblies where one position needs to close two circuits simultaneously, such as selecting between "Hand" and "Auto" operating modes on a motor control panel. 

Q: Is the CT02C suitable for outdoor or wet-area control panels?

The CT02C carries an IP65 rating, meaning the assembled pushbutton unit is protected against dust ingress and low-pressure water jets from any direction. This makes it appropriate for use in outdoor pushbutton stations, washdown environments such as food processing or car wash plant, and external motor control panels — provided the pushbutton enclosure body itself is also IP65 rated, which is standard for IMO's PB enclosure range. 

Who Can Install It?

The CT02C is an industrial control component intended for installation by qualified electricians or panel builders with appropriate industrial controls experience. While the contact block itself operates at low control voltages and relatively modest currents, it is always installed as part of a larger pushbutton station or control panel that forms part of a mains-voltage electrical installation. Wiring the completed pushbutton assembly into a motor starter, PLC input module, or contactor control circuit requires both electrical competence and an understanding of the relevant control circuit design. In the UK, this work falls within the scope of BS 7671 (IET Wiring Regulations) and, where connected to a fixed installation, must be carried out or certified by a suitably qualified and registered electrician. Maintenance engineers and industrial electricians in manufacturing environments regularly replace worn or faulty contact blocks as a routine maintenance task under appropriate isolation procedures, but initial panel build and first connection should always be handled by a qualified professional.

What Is It Used For?

The CT02C is a control circuit switching component that provides two independent make contacts within a single pushbutton or selector switch assembly. Its principal applications are:

• Motor start/stop control stations — the CT02C is the standard contact block for the green "Start" button in a DOL starter pushbutton station, simultaneously closing the contactor coil circuit and a PLC run-confirm or seal-in circuit with a single button press
• Dual-circuit signalling — wherever one physical operator action must simultaneously trigger two separate control signals, such as starting a process and activating an audible alarm or indicator lamp
• Machine tool and automation panels — installed in the operator panel of CNC machines, conveyors, presses, mixers, and other automated plant where two outputs are needed from a single button
• Selector switch assemblies — used behind rotary or key-operated selector switches where a selected position must close two independent circuits, for example energising two separate motor circuits or enabling two interlinked process functions
• Building services and HVAC control panels — fitted into pump set or air handling unit control panels where the "Run" button must simultaneously activate the motor contactor and signal the BMS or remote status indicator
• Stop/Start triple pushbutton stations, where the CT02C is paired with a CT01C on the stop button and a pilot lamp, all housed within a single multi-gang enclosure such as the IMO EN04C triple enclosure

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