UL Sizing Chart (1 Phase)

HP Volts Motor AmpsWire Size

(AWG)

Bend Radius

(Inches)Contactor

Cerus Motor OverloadManual Motor

StarterMotor Circuit

ProtectorThermal Electronic

1/10120 3.0 12 - MRC-9B MTK-32/3-4 CRP22-3P 5A CMS-32H-4 CMS-32HI-4230 1.5 12 - MRC-9B MTK-32/3-1.6 CRP22-3P 5A CMS-32H-1.6 CMS-32HI-1.6

1/8120 3.8 12 - MRC-9B MTK-32/3-4 CRP22-3P 5A CMS-32H-4 CMS-32HI-4230 1.9 12 - MRC-9B MTK-32/3-2.5 CRP22-3P 5A CMS-32H-2.5 CMS-32HI-2.5

1/6120 4.4 12 - MRC-9B MTK-32/3-6 CRP22-3P 5A CMS-32H-6 CMS-32HI-6230 2.2 12 - MRC-9B MTK-32/3-2.5 CRP22-3P 5A CMS-32H-2.5 CMS-32HI-2.5

1/4120 5.8 12 - MRC-9B MTK-32/3-8 CRP22-3S 22A CMS-32H-8 CMS-32HI-6230 2.9 12 - MRC-9B MTK-32/3-4 CRP22-3P 5A CMS-32H-4 CMS-32HI-4

1/3120 7.2 12 - MRC-9B MTK-32/3-8 CRP22-3S 22A CMS-32H-8 CMS-32HI-8230 3.6 12 - MRC-9B MTK-32/3-4 CRP22-3P 5A CMS-32H-4 CMS-32HI-4

1/2120 9.8 12 - MRC-9B MTK-32/3-13 CRP22-3S 22A CMS-32H-13 CMS-32HI-10230 4.9 12 - MRC-9B MTK-32/3-6 CRP22-3S 22A CMS-32H-6 CMS-32HI-6

3/4120 13.8 12 - MRC-12B MTK-32/3-18 CRP22-3S 22A CMS-32H-17 CMS-32HI-17230 6.9 12 - MRC-9B MTK-32/3-8 CRP22-3S 22A CMS-32H-8 CMS-32HI-8

1120 16.0 12 - MRC-18B MTK-32/3-18 CRP22-3S 22A CMS-32H-17 CMS-32HI-17230 8.0 12 - MRC-9B MTK-32/3-9 CRP22-3S 22A CMS-32H-10 CMS-32HI-8

1 1/2120 20.0 12 - MRC-22B MTK-32/3-25 CRP22-3S 22A CMS-32H-22 CMS-32HI-22230 10.0 12 - MRC-12B MTK-32/3-13 CRP22-3S 22A CMS-32H-13 CMS-32HI-10

2120 24.0 10 - MRC-22B MTK-32/3-25 CRP40-3S 40A CMS-32H-26 CMS-32HI-26230 12.0 12 - MRC-12B MTK-32/3-13 CRP22-3S 22A CMS-32H-13 CMS-32HI-13

3120 34.0 8 1.5 MRC-40A MTK-63/3-40 CRP40-3S 40A CMS-32H-40 CMS-32HI-40230 17.0 12 - MRC-18B MTK-32/3-22 CRP22-3S 22A CMS-32H-22 CMS-32HI-17

5120 56.0 6 1.5 MRC-65LA MTK-63/3-65L CRP80-3S 80A CMS-63H-63 CMS-63HI-63230 28.0 10 - MRC-32A MTK-32/3-32 CRP40-3S 40A CMS-32H-32 CMS-32HI-32

7 1/2120 80.0 4 2 MRC-85LA MTK-95/3-85L - CMS-100H-90 CMS-100HI-90230 40.0 8 1.5 MRC-40LA MTK-63/3-50L CRP80-3S 80A CMS-32H-40 CMS-32HI-40

10120 100.0 3 2 MRC-100LA MTK-95/3-100L - - CMS-100HI-100230 50.0 8 1.5 MRC-50LA MTK-63/3-65L CRP80-3S 80A CMS-63H-63 CMS-63HI-50

15120 135.0 1/0 5 MRC-150LA MTK-150/3-150L - - -230 68.0 4 2 MRC-75LA MTK-95/3-75L CRP80-3S-80A CMS-100H-75 CMS-100HI-75

To Find Single Phase Three Phase

Efficiency HP x 746E x I x PFHP x 746

E x I x PF x 1.73

Power Factor Input WattsV x AInput Watts

E x I x PF x 1.73

Motor Engineering Formulas

P EI R

I x RI2 x R

E x I

PI

ER

E2

R

PE

EI

E2

PPI2

P x R

PR

Ohms Law

Motor Application FormulasHP = Torque (lb-ft) x RPM

Torque (lb-ft) = HP x 5252

5252

RPM

AC Efficiency & Power Factor Formulas

AC/DC Formulas

To Find DC 1 Phase 3 PhaseAmps when HP is known

HP x 746E x Eff

HP x 746E x Eff x PF

HP x 746E x Eff x PF X 1.73

Amps when kW is known

kW x 1000E

kW x 1000E x PF

kW x 1000E x PF x 1.73

Amps when kVA is known -

kVA x 1000E

kVA x 1000E x 1.73

kW I x E1000I x E x PF

1000I x E x PF x 1.73

1000

kVA - I x E1000I x E x 1.73

1000

HP (Output)

I x E x Eff746

I x E x Eff x PF746

I x E x Eff x PF x 1.73746

LegendE = Volts I = Amps W = Watts PF = Power Factor Eff = Efficiency HP = Horsepower 1HP = 746 Watts

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UL Sizing Chart (3 Phase)

* Field wiring requires two conductors

HP Volts Motor AmpsWire Size

(AWG)

Bend Radius

(Inches) Contactor

Cerus Motor OverloadManual Motor

StarterMotor Circuit

ProtectorThermal Electronic

1/2208 2.4 12 - MRC-9B MTK-32/3-2.5 CRP22-3S 5A CMS-32H-2.5 CMS-32HI-2.5230 2.2 12 - MRC-9B MTK-32/3-2.5 CRP22-3S 5A CMS-32H-2.5 CMS-32HI-2.5480 1.1 12 - MRC-9B MTK-32/3-1.6 CRP22-3S 1.5A CMS-32H-1.6 CMS-32HI-1.6

3/4208 3.5 12 - MRC-9B MTK-32/3-4 CRP22-3S 5A CMS-32H-4 CMS-32HI-4230 3.2 12 - MRC-9B MTK-32/3-4 CRP22-3S 5A CMS-32H-4 CMS-32HI-4480 1.6 12 - MRC-9B MTK-32/3-1.6 CRP22-3S 5A CMS-32H-1.6 CMS-32HI-1.6

1208 4.6 12 - MRC-9B MTK-32/3-6 CRP22-3S 5A CMS-32H-6 CMS-32HI-6230 4.2 12 - MRC-9B MTK-32/3-6 CRP22-3S 5A CMS-32H-6 CMS-32HI-6480 2.1 12 - MRC-9B MTK-32/3-2.5 CRP22-3S 5A CMS-32H-2.5 CMS-32HI-2.5

1 1/2208 6.6 12 - MRC-9B MTK-32/3-8 CRP22-3S 22A CMS-32H-8 CMS-32HI-8230 6.0 12 - MRC-9B MTK-32/3-8 CRP22-3S 22A CMS-32H-8 CMS-32HI-8480 3.0 12 - MRC-9B MTK-32/3-4 CRP22-3S 5A CMS-32H-4 CMS-32HI-4

2208 7.5 12 - MRC-9B MTK-32/3-9 CRP22-3S 22A CMS-32H-8 CMS-32HI-8230 6.8 12 - MRC-9B MTK-32/3-9 CRP22-3S 22A CMS-32H-8 CMS-32HI-8480 3.4 12 - MRC-9B MTK-32/3-4 CRP22-3S 5A CMS-32H-4 CMS-32HI-4

3208 10.5 12 - MRC-12B MTK-32/3-13 CRP22-3S 22A CMS-32H-13 CMS-32HI-13230 9.6 12 - MRC-9B MTK-32/3-13 CRP22-3S 22A CMS-32H-13 CMS-32HI-10480 4.8 12 - MRC-9B MTK-32/3-6 CRP22-3S 5A CMS-32H-6 CMS-32HI-6

5208 16.7 12 - MRC-18B MTK-32/3-18 CRP22-3S 22A CMS-32H-22 CMS-32HI-22230 15.2 12 - MRC-12B MTK-32/3-18 CRP22-3S 22A CMS-32H-17 CMS-32HI-17480 7.6 12 - MRC-9B MTK-32/3-9 CRP22-3S 22A CMS-32H-10 CMS-32HI-8

7 1/2208 24.0 10 - MRC-22B MTK-32/3-25 CRP40-3S 40A CMS-32H-26 CMS-32HI-26230 22.0 10 - MRC-18B MTK-32/3-25 CRP40-3S 40A CMS-32H-26 CMS-32HI-26480 11.0 12 - MRC-12B MTK-32/3-13 CRP22-3S 22A CMS-32H-13 CMS-32HI-13

10208 31.0 8 1.5 MRC-40A MTK-32/3-40 CRP40-3S 40A CMS-32H-40 CMS-32HI-40230 28.0 10 - MRC-22B MTK-32/3-32 CRP40-3S 40A CMS-32H-32 CMS-32HI-32480 14.0 12 - MRC-18B MTK-32/3-18 CRP22-3S 22A CMS-32H-17 CMS-32HI-17

15208 46.0 8 1.5 MRC-50LA MTK-63/3-50L CRP80-3S 80A CMS-63H-50 CMS-63HI-50230 42.0 8 1.5 MRC-50LA MTK-63/3-50L CRP80-3S 80A CMS-63H-50 CMS-63HI-50480 21.0 10 - MRC-22B MTK-32/3-25 CRP40-3S 40A CMS-32H-22 CMS-32HI-22

20208 59.0 6 1.5 MRC-50LA MTK-63/3-65L CRP80-3S 80A CMS-63H-63 CMS-63HI-63230 54.0 6 1.5 MRC-50LA MTK-63/3-65L CRP80-3S 80A CMS-63H-63 CMS-63HI-63480 27.0 10 - MRC-32A MTK-32/3-32 CRP40-3S 40A CMS-32H-32 CMS-32HI-32

25208 75.0 4 2 MRC-75LA MTK-95/3-85L CRP80-3S 80A CMS-100H-90 CMS-100HI-90230 68.0 4 2 MRC-75LA MTK-95/3-75L CRP80-3S 80A CMS-100H-75 CMS-100HI-75480 34.0 8 1.5 MRC-40A MTK-32/3-40 CRP40-3S 40A CMS-63H-40 CMS-63HI-40

30208 88.0 3 2.0 MRC-85LA MTK-95/3-95L - CMS-100H-100 CMS-100HI-100230 80.0 4 2 MRC-75LA MTK-95/3-85L - CMS-100H-90 CMS-100HI-90480 40.0 8 1.5 MRC-40A MTK-32/3-40 CRP40-3S 40A CMS-63H-40 CMS-63HI-40

40208 114.4 2 2.5 MRC-130LA MTK-150/3-130L - - -230 104.0 2 2.5 MRC-130LA MTK-150/3-105L - - -480 52.0 6 1.5 MRC-50LA MTK-63/3-65L CRP80-3S 80A CMS-63H-63 CMS-63HI-63

50208 143.0 1/0 5 MRC-185A MTK-225/3-160 - - -230 130.0 1 3 MRC-150LA MTK-150/3-150L - - -480 65.0 6 1.5 MRC-65LA MTK-95/3-75L CRP80-3S 80A CMS-100H-75 CMS-100HI-75

60208 169.4 2/0 6 MRC-185A MTK-225/3-185L - - -230 154.0 2/0 6 MRC-185A MTK-225/3-185L - - -480 77.0 4 2 MRC-85LA MTK-95/3-85L CRP80-3S 80A CMS-100H-90 CMS-100HI-90

75208 211.2 4/0 7 MRC-330A MTK-400/3-240 - - -230 192.0 3/0 7 MRC-225A MTK-225/3-240 - - -480 96.0 3 2 MRC-100LA MTK-95/3-100L - CMS-100H-100 CMS-100HI-100

100208 272.8 2 x 1/0 5* MRC-330A MTK-400/3-300 - - -230 248.0 2 x 1/0 5* MRC-330A MTK-400/3-300 - - -480 124.0 1 3 MRC-150LA MTK-150/3-150L - - -

125208 343.2 2 x 2/0 6 MRC-400A MTK-400/3-400 - - -230 312.0 2 x 2/0 6 MRC-330A MTK-400/3-400 - - -480 156.0 2/0 6 MRC-185A MTK-225/3-185 - - -

150208 396.0 2 x 3/0 7* MRC-630A MTK-800/3-400 - - -230 360.0 2 x 3/0 7* MRC-400A MTK-400/3-400 - - -480 180.0 3/0 7 MRC-225A MTK-225/3-240 - - -

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