Electrical Tools Main Page

Page 1: Detailed switchgear sizing. Component-level cable selection.

DH & System Component Selection Tool Auto Cable Schedule Draw SLD EN 60204-1 Cable Sizing
Input Parameters
Note: The tool will calculate Full Load Current (FLC) if not provided, and apply safety factors of 1.25x for Normal Duty and 1.5x for Heavy Duty.
Calculation Results
Calculation Steps

Duty Comparison

Normal Duty
MCB (Miniature Circuit Breaker)
MCCB (Molded Case Circuit Breaker)
Contactor
MPCB (Motor Protection Circuit Breaker)
Heavy Duty
MCB (Miniature Circuit Breaker)
MCCB (Molded Case Circuit Breaker)
Contactor
MPCB (Motor Protection Circuit Breaker)
Cable Selection
Cable Size Recommendation
Cable Details
Device & Cable Range Catalog

MCCB Standard Ranges

Molded Case Circuit Breakers are available in the following standard current ratings:

Current Rating (A) Breaking Capacity Common Applications
10, 16, 20, 25 10kA Small commercial installations
32, 40, 50, 63 15kA Commercial and light industrial
80, 100, 125 25kA Industrial applications
160, 200, 250 35kA Heavy industrial applications
320, 400, 500 50kA Main distribution boards
630, 800, 1000 65kA Large industrial main feeders

MCB Standard Ranges

Miniature Circuit Breakers are available in the following standard current ratings:

Current Rating (A) Type Common Applications
6, 10 Type B Lighting circuits, general purpose outlets
16, 20 Type B, C General purpose circuits, air conditioners
25, 32 Type C Kitchen appliances, water heaters
40, 50 Type C, D Industrial equipment, motors
63 Type D Heavy machinery, transformers

MPCB Standard Ranges

Motor Protection Circuit Breakers are available in the following standard current ratings:

Current Rating (A) Motor Power (kW) at 400V Protection Features
0.1 - 0.16 0.06 - 0.09 Overload, short-circuit
0.25 - 0.4 0.12 - 0.18 Overload, short-circuit
0.63 - 1.0 0.25 - 0.37 Overload, short-circuit
1.6 - 2.5 0.55 - 0.75 Overload, short-circuit, phase failure
4 - 6.3 1.1 - 1.5 Overload, short-circuit, phase failure
10 - 16 2.2 - 3.0 Overload, short-circuit, phase failure
20 - 25 4.0 - 5.5 Overload, short-circuit, phase failure
32 - 40 7.5 - 11 Overload, short-circuit, phase failure
50 - 63 15 - 18.5 Overload, short-circuit, phase failure
80 - 100 22 - 30 Overload, short-circuit, phase failure

Contactor Standard Ranges

Contactors are available in the following standard current ratings:

Current Rating (A) Coil Voltage Common Applications
9 - 12 24V, 110V, 230V Small motors, lighting control
18 - 25 24V, 110V, 230V, 400V HVAC systems, small pumps
32 - 40 24V, 110V, 230V, 400V Industrial motors, compressors
50 - 65 110V, 230V, 400V Medium power motors, conveyors
80 - 95 230V, 400V Large motors, industrial machinery
115 - 150 230V, 400V Heavy machinery, large pumps
185 - 225 400V, 525V High power applications
300 - 400 400V, 525V Main power distribution
500 - 600 400V, 525V Large industrial applications

Cable Standard Ranges

Standard PVC insulated copper cables and their current carrying capacity (in air at 30°C):

Cable Size (mm²) Current Rating (A) Max Power (kW) at 400V 3-phase Typical Applications
1.5 16 11 Lighting circuits, small appliances
2.5 21 14.5 Socket outlets, lighting circuits
4 28 19.5 Cooker circuits, immersion heaters
6 36 25 Shower circuits, small motors
10 46 32 Small distribution circuits
16 61 42 Sub-main circuits, medium motors
25 80 55 Distribution boards, large motors
35 99 68 Main supply cables
50 121 84 Main supply cables
70 155 107 Heavy industrial applications
95 188 130 Heavy industrial applications
120 218 151 Large industrial installations
150 250 173 Large industrial installations
185 285 197 High power distribution
240 340 235 High power distribution