What size breaker do I need for a 20 amp motor?

What size breaker do I need for a 20 hp motor?

Full Load Current: Three Phase AC Motors

Motor Horsepower Size Breaker
7-1/2 230V 460V 40 30
10 230V 460V 50 30
15 230V 460V 70 40
20 230V 460V 100 50

How do you size a circuit breaker for a motor?

You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)]. You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52].

How many amps should you run on a 20-amp breaker?

An important note to remember is that circuit breakers can only handle about 80% of their overall amperage. That means a 15-amp circuit breaker can handle around 12-amps and a 20-amp circuit breaker can handle about 16 amps.

THIS IS INTERESTING:  Are Maxi Cosi car seats toxic?

What size breaker do I need for a 21 amp motor?

How to Calculate How What Size Circuit Breaker a Machine will Need:

HorsePower of Main Motor 220 Volts, 1 phase 440 Volts, 3 phase
10 56 14
15 84 21
20 112 28
25 140 35

How many amps does a 20hp motor draw?

AC Motor Full Load Amperes

HP 200 Volts 208 Volts
20 62.1 59.4
25 78.2 74.8
30 92 88
40 120 114

How many amps does a 20 hp motor draw?


HP 1 Phase Amps 3 Phase Amps
115 volt 208 volt
10 100 30.8
15 46.2
20 59.4

How do I choose a motor breaker?

How to choose a motor circuit breaker?

  1. Long delay current setting value—motor rated current.
  2. Instantaneous setting current. …
  3. The returnable time of the 6 times long delay current setting value ≥ the actual starting time of the motor.

What size breaker do I need for a 30 hp motor?

Full-Load Current and Circuit Protection Data for Three-Phase AC Motors

Motor Horsepower Breaker Size
25 230 V 460 V 100 50
30 230 V 460 V 125 70
40 230 V 460 V 175 100
50 230 V 460 V 200 150

What type of circuit breaker does a motor use?

The motor protection circuit breaker can be considered a subtype of a thermal magnetic circuit breaker, but with additional functions that are specially designed to protect electric motors. The basic working principle is similar to all other circuit breakers.

How far can you run a 20 amp circuit?

You can run a 10 gauge wire up to 85 feet on a 20 amp circuit. If you opt to use this type of wire on a 15 amp circuit, it can run up to 115 feet. After these distances, the circuit will go over the recommended 3% voltage drop.

THIS IS INTERESTING:  What is the use of back EMF in DC motor?

How many devices can be on a 20 amp circuit?

Devices on a 20 Amp Circuit

Because not all the outlets will be used (drawing power). However, they do put a limit on the maximum power load a circuit and its breaker should carry – no more than 80% of its rating. This means a 20 amp circuit should only carry 16 amps at maximum – or about ten devices.

What size breaker should I use?

The general rule of thumb is that circuit breaker size should be 125% of the ampacity of cable and wire or the circuit which has to be protected by the CB. Let see the following solved examples: Example 1: Suppose, a 12 gauge wire is used for 20 amperes lighting circuit having 120V single phase supply.

What size breaker do I need for a 230 volt well pump?

Most submersible well pumps are 230 volts and require a 2 pole circuit breaker (2 individual circuit breakers connected together).

How many amps does a 2 hp motor pull?

Common Horsepower to Amps Conversions

Horsepower Amps Voltage
1.25 HP 8.63 A 120 V
1.5 HP 10.4 A 120 V
1.75 HP 12.1 A 120 V
2 HP 13.8 A 120 V

What size breaker do I need for a 15 amp motor?

A 12 wire and a 20A breaker is needed. 15A ends can be used on 20A circuits.