Lovato CNM2020220 Modular Contactor 2P 20 A, 220 V AC/DC

Lovato CNM2020220 modular contactor, 2-pole 20 A, 220 V AC/DC coil

The Lovato CNM2020220 is a one-module wide, two-pole modular contactor for DIN rail with two normally open contacts, 20 A in AC-1, 9 A in AC-3 and a 220 V AC/DC coil. It carries a manual control lever. Seven Star LLC supplies the CNM2020220 in Oman and the GCC as an independent supplier in Muscat.

The code CNM2020220 breaks down as CNM (modular contactor with manual control), 20 (20 A), 20 (two NO poles) and 220 (coil 220 V). Variants such as the CNM2020024 use a 24 V coil, and the catalogue also lists CN-prefixed codes such as CN2020220, so confirm the manual-control feature against the code when ordering.

CNM2020220 technical specifications

Why modular contactors are quiet and compact

Modular contactors of this kind are designed for installations where the contactor is switched on and off many times a day and must not hum or chatter. The coil data show a power of only 2.5 W both for pull-in and holding, and the same coil is specified for either 220 V AC or DC. The pick-up and drop-out limits, 85 to 110 percent and 20 to 75 percent of Us, give a stable operating window.

Do not confuse the ratings: AC-1 means resistive loads such as heaters and lighting, up to 20 A, whereas AC-3 relates to motor starting at only 9 A, and 17 V and 50 mA is the minimum load below which contact reliability is not guaranteed.

Where the CNM2020220 fits

It is used in building and light-industrial distribution boards: lighting groups, heater banks, water-heater control, pumps with single-phase motors and load shedding. The manual lever lets the electrician close or open the contacts without power, a useful aid for testing a circuit or overriding a failed control. Related catalogue entries include the CNM2020024 and CN2020220 with different coils or no manual control.

CNM2020220 selection and ordering checklist

• Load category and current: AC-1 up to 20 A, AC-3 up to 9 A
• Coil voltage: 220 V AC/DC for this code
• Manual control lever required or not
• Switching frequency and expected life
• Heat in the board: 1.7 W per pole
• Rail space of one module

Installation and maintenance of the CNM2020220

Mount on a 35 mm rail, torque power terminals to 1.2 Nm and coil terminals to 0.6 Nm with a PZ2 screwdriver. Allow spacing from neighbouring devices when several contactors are fitted side by side because of the dissipation per pole. Inspect for heat discolouration at the terminals; those are the first signs of a loose connection.

Typical CNM2020220 applications in Oman and the GCC

In villas, camps and commercial buildings across the region it controls air-conditioning units, water heaters, outdoor lighting and pump circuits from a timer or building controller. High ambient temperatures near the 70 °C limit are rare inside a board, but airless metal kiosks can approach it. For building services, label each contactor with the circuit it controls and record whether the manual lever was left in the auto position after testing, since a lever left closed keeps a load energised regardless of the control signal.

Heat and sizing for the CNM2020220 in a distribution board

Each pole dissipates about 1.7 W at its rated 20 A, so a two-pole contactor adds about 3.4 W, plus 2.5 W from the coil, to the board. Several in a row quickly become a noticeable heat source in a sealed box, so leave one module of space between units that switch heavy loads continuously. Where the contactor controls a heater load, remember that the thermal current of 20 A is the limit with the contactor at 40 °C or below; in a hotter enclosure choose a lower load or a larger contactor.

The coil operating window means a supply that sags to 85 percent of rated voltage will still pull the contactor in, and one that falls below 20 to 75 percent will release it. Supplies from long cables to remote controllers should be checked for voltage drop, as marginal voltage causes chatter that damages contacts.

Information to send with an RFQ for the CNM2020220

• Part number CNM2020220 and quantity
• Load type and current
• Control voltage
• Need for manual control
• Board ambient temperature
• Delivery location

Site conditions in Oman for the CNM2020220

Low-voltage switching and protection devices in Oman often sit in motor control centres and outdoor panels where internal temperatures are high for much of the year. When you select the CNM2020220, check its rated values at your real ambient temperature, as stated in the manufacturer documentation, and confirm the coordination with upstream protection and with the motor or load it serves. Short-circuit levels differ from site to site, so verify the breaking capacity required at the point of installation.

Standardising ratings and coil voltages across a project reduces the number of spare part numbers that need to be stocked. Keeping a small stock of the CNM2020220 and recording settings such as trip ranges or ramp times shortens repair work during a breakdown.

Documents and quotation

Send the part number CNM2020220 and we will confirm the documents available for it, such as the technical data sheet, wiring diagram and instruction sheet, together with availability and lead time.

Seven Star LLC is an independent supplier in Muscat and is not an official channel of the manufacturer. Share the quantity, delivery location and project reference with the request and we will answer with a formal quotation.