*mydirectindustry

Catalogs
BENDER GmbH & Co KG
LINETRAXX® CMD420/CMD421

LINETRAXX® CMD420/CMD421

Product catalog summary

Device Features
LINETRAXX® CMD420/CMD421 devices are designed for monitoring undercurrent and overcurrent in AC systems using standard current transformers. They feature two adjustable alarm relays, a digital LC display, and various operational settings such as start-up delay and response delay. The devices also include password protection and are available with different terminal types.

Product Description
The CMD420/421 monitors AC currents through three measuring inputs for overcurrent and undercurrent. The devices display measured values on an LC display and store values that trigger alarms. They require external supply voltage and are suitable for applications like motor current monitoring and lighting circuits.

Functionality
The devices use a window discriminator function to monitor current levels. They have adjustable response values for overcurrent and undercurrent, with alarm relays activating when these values are exceeded. The devices also feature a fault memory that can be reset manually.

Technical Specifications
Both CMD420 and CMD421 have specific measuring ranges and overload capabilities. CMD420 is designed for x/1A transformers, while CMD421 is for x/5A transformers. They support a wide frequency range and have adjustable hysteresis and delay settings.

Insulation and Safety
The devices comply with IEC standards for insulation and safety, featuring protective separation and voltage testing. They are designed for continuous operation and can be mounted in various positions.

Environmental and Mechanical Conditions
The devices operate within a temperature range of -25 to +55 °C and are classified for specific climatic and mechanical conditions according to IEC standards.

Connection and Mounting
CMD420/421 devices offer screw-type or push-wire terminal connections, with specific properties for conductor sizes and stripping lengths. They are designed for DIN rail or screw mounting.

Ordering Information
The devices are available in different configurations based on the type of current transformer and supply voltage. Accessories such as mounting clips are also available.

Catalog excerpts

Current monitoring devices for monitoring 3AC currents for overcurrent and undercurrent using measuring current transformers or current monitoring with window discriminator function

Open the catalog to page 1

Current monitoring devices LINETRAXX® CMD420/CMD421 Z BENDER LINETRAXX® CMD420/CMD421 Current monitoring devices for monitoring 3AC currents for overcurrent or undercurrent using measuring current transformers or with window discriminator function Device features • Undercurrent and overcurrent monitoring in AC systems, current monitoring with window discriminator function • Current monitoring using standard current transformers: • Two separately adjustable alarm relays with one changeover contact each (K1, K2) • Fault memory behaviour for the alarm relays selectable • Digital measured value display...

Open the catalog to page 2

Current monitoring devices LINETRAXX® CMD420/CMD421 1 - Power On LED "ON" (green); lights when supply voltage is applied and flashes in the event of system fault alarm 2 - Alarm LED "AL1" (yellow): lights when the value exceeds or falls below the set response values and flashes in the event of system fault alarm 3 - Alarm LED "AL2" (yellow): lights when the value exceeds or falls below the set response values and flashes in the event of system fault alarm Arrow up button: To change the measured value display, move upwards in the menu or to change parameters. To call up the self test: press the...

Open the catalog to page 3

Current monitoring devices LINETRAXX® CMD420/CMD421 Z BENDER Technical data CMD420... Rated insulation voltage AC 250 V Rated impulse voltage/pollution degree 6 kV/3 CMD421... Rated insulation voltage Rated impulse voltage/pollution degree Basic insulation between: Basic insulation between: Time response Start-up delay t Response delay ton1 Response delay ton2 Delay on release toff Resolution of setting t, ton1/2, toff (0.10 s) Resolution of setting t, ton1/2, toff (10.99 s) Resolution of setting t, ton1/2, toff (100.300 s) Device release time tre Release time toff Supply voltage Supply voltage...

Open the catalog to page 4

Current monitoring devices LINETRAXX® CMD420/CMD421 Connection Connection properties rigid flexible without ferrules with ferrules Stripping length Opening force Test opening, diameter Other Operating mode Mounting Degree of protection, internal components (IEC 60529) Degree of protection, terminals (IEC 60529) Enclosure material Flammability class DIN rail mounting acc. to Screw mounting Documentation number Weight continuous operation any position IP30 IP20 polycarbonate UL94V-0 IEC 60715 2 x M4 with mounting clip D00101 < 150 g Ordering information Dimension diagram XM420 Dimensions in mm

Open the catalog to page 5

BENDER Group CMD420-421_D00101_02_D_XXEN / 01.2022 / © Bender GmbH & Co. KG, Germany – Subject to change! The specified standards take into account the edition valid until 01.2022 unless otherwise indicated. Bender GmbH & Co. KG Londorfer Straße 65 • 35305 Grünberg • Germany Tel.: +49 6401 807-0 • [email protected] • www

Open the catalog to page 6

LINETRAXX® CMD420/CMD421

LINETRAXX® CMD420/CMD421

Catalog excerpts

All BENDER GmbH & Co KG catalogs and technical brochures