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M21 M21 series

M21 M21 series

M21 M21 series

Product catalog summary

M21 Series Switch-Disconnectors Overview

The M21 series switch-disconnectors comply with IEC 60947-3 standards and are designed for fuse base mounting in 3-pole (3P) and 3-pole plus neutral (3P+N) configurations. They are available in multiple sizes and current ratings, suitable for various industrial electrical protection applications.

Product Range and Ratings

  • Size 1: Rated currents of 160 A, 200 A, and 250 A.
  • Size 2: Rated currents of 250 A, 315 A, and 400 A.
  • Size 3: Rated currents of 630 A and 800 A.

Technical Specifications

ParameterSize 1Size 2Size 3
Rated Thermal Current (Ith) at 40°C (A)160 - 250250 - 400630 - 800
Rated Insulation Voltage (Ui) (V)80010001000
Rated Impulse Withstand Voltage (Uimp) (kV)81212
Rated Breaking Capacity at 400 V (A)1280 - 20002000 - 32005040
Rated Making Capacity at 400 V (A)1600 - 25002500 - 40006300
Rated Conditional Short-Circuit Current (Iq) (kA rms)100100100
Maximum Cut-Off Current (kA peak)26.343.360.8
Power Dissipation (A2s x 10^3)47816004600
Number of Mechanical Operations (cycles)80005000 - 80003000 - 5000
Maximum Weight 3P (kg)3.16.613
Maximum Weight 3P+N (kg)4815

Fuse Compatibility and Dimensions

The switch-disconnectors accommodate NH/DIN fuses of sizes 0, 1, 2, and 3 depending on the model. Fuse bases are available for 3P and 4P configurations. Power dissipation values for fuse links vary by size and type, with specific values provided for NH/DIN and BS fuse types.

Mechanical and Installation Features

  • Door drilling templates are provided for external handle and key lock device installation.
  • Handles are available in direct, external (IP65 rated), and emergency external types with included shafts.
  • Shaft extensions and rear protective plates are available as accessories.
  • Terminal shrouds kits are offered for input and output terminals in 3P and 4P versions.
  • Safety key lock devices (simple and double) allow locking the handle in OFF or ON positions, with key removal only possible when locked.

Auxiliary Contacts

Auxiliary contact options include 1NO+1NC and 2NO+2NC configurations, rated for 16 A resistive and 4 A inductive loads at 250 VAC.

Standards and Compliance

All products conform to IEC 60947-3, ensuring compliance with international standards for switch-disconnectors.

Summary of Critical Parameters and Recommendations

  • Ensure fuse links used match the rated current and power dissipation specifications to maintain safety and performance.
  • Consult manufacturer for fuse links with higher power dissipation or for other voltages and utilization categories.
  • Use protective devices limiting cut-off current and joule integral to specified values for rated conditional short-circuit currents.
  • 4P switch versions are available on request for all sizes.
  • Regular maintenance and adherence to mechanical operation limits (cycles) are recommended to ensure longevity.
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Catalog excerpts

M21 M21 series-1

External handle included shaft * Ie = 16 A (resistive loads) 4 A (inductive loads) at 250 Vac. Safety key lock device Direct handle For external handle, lock the handle by means of a key in position “OFF” (under request, in “ON”), the key can only be removed with the handle locked Door drilling for handle and key lock device Simple Double Standard shaft included *(e1) L (mm) Rated breaking capacity 400 V; cos φ = 0,35÷0,45 Rated making capacity Maximum power dissipation Short - circuit behaviour Rated conditional short-circuit current *(3) Rated conditional short-circuit making *(3) Rated insulation voltage Rated impulse withstand voltage Power dissipation in fuse links *(1) Door drilling for external handle Maximum dimensions Also available 4P switches under request, please consult *(1) Power dissipation values of fuse - links used in type tests. Please consult for fuse - links with higher power dissipation *(2) Other voltages and / or utilization categories; please consult us *(3) With a protective device limiting the cut - off current and the joule integral to the indicated values AC rated operational current *(2) (Rated frequency 50 / 60 Hz) Number of mechanical operations (according to the standards, for other values please consult) Rated thermal current in enclosure Rear protective plate Rated thermal current in ambient at 40 ºC Technical information Shaft extensions Simple CODE DS-CA11 Double CODE DS-CEB1 CODE CODE Emergency external handle Terminal shrouds External handle top view Switch fuses base mounting 3P - 3P+N

 Open the catalog to page 1
M21 M21 series-2

Terminal shrouds 3P INPUT External handle included shaft * Auxiliary contacts CODE CODE Ie = 16 A (resistive loads) 4 A (inductive loads) at 250 Vac. Emergency external handle Safety key lock device Door drilling for handle and key lock device Simple Double Standard shaft included *(e1) Rated making capacity Rated conditional short-circuit current *(3) A Short - circuit behaviour Iq Maximum power dissipation Rated conditional short-circuit making *(3) Rated insulation voltage Rated impulse withstand voltage Power dissipation in fuse links *(1) Number of mechanical operations (according to the...

 Open the catalog to page 2
M21 M21 series-3

External handle included shaft * Safety key lock device For external handle, lock the handle by means of a key in position “OFF” (under request, in “ON”), the key can only be removed with the handle locked Standard shaft included *(e1) Door drilling for handle and key lock device Simple Double Shaft extensions Rated breaking capacity 400 V; cos φ = 0,35÷0,45 Rated making capacity Rated insulation voltage Rated impulse withstand voltage Power dissipation in fuse links *(1) Door drilling for external handle Rated conditional short-circuit making *(3) Also available 4P switches under request, please...

 Open the catalog to page 3

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.