AC Contactors and Starters

Catalogs > Industrial Controls Catalog > Motor Control, NEMA > Contactors, Starters, and Overload Relays > AC Contactors and Starters > Bulletin 305 AC Starters

Bulletin 305 AC Starters

Introduction Standards Compliance and Certifications Product Selection Bulletin 193-EE — E1 Plus 3-Phase Electronic
Overload Relays		 Specifications Approximate Dimensions
Specifications

Electrical Life in Utilization Category

Utilization Categories

Category Typical Duty
AC3 Starting of squirrel-cage motors and switching only after the motor is up to speed.
AC4 Starting of squirrel-cage motors with inching and plugging duty.
 

Contact Life for Mixed Utilization Categories AC3 and AC4

In many applications, the utilization category cannot be defined as either purely AC3 or AC4. In those applications, the electrical life of the contactor can be estimated from the following equation:

Click to enlarge - 305_equation


Lmixed Approximate contact life for a mixed AC3/AC4 utilization category application.
LAC3 Approximate contact life in operations for AC3 utilization category (from AC3 life-load curves below).
LAC4 Approximate contact life in operations for AC4 utilization category (from AC4 life-load curves below).
PAC4 Percentage of AC4 operations.
 

Bulletin 305/309 Load/Life Curves — AC-3 and AC-4

Bulletin 305/309 Line starters are designed to provide superior performance in a variety of applications. These load-life curves are based on Rockwell Automation tests according to the requirements defined in IEC 947-4. Actual contact life may vary based on the application, duty cycle, and environmental conditions differing from those indicated by the curves.

To find the contactor’s estimated electrical life, follow these guidelines:

1.   Choose the appropriate graph that most closely approximates the utilization category of the application.

2.   Locate the intersection of the life-load curve of the appropriate contactor with the application's operational current (le) found on the horizontal axis.

3.   Read the estimated contact life in millions of operations along the vertical axis.

NEMA Size 0…2

Click to enlarge - 305_AC-3_Graph


Click to enlarge - 305_AC-4_Graph


NEMA Size 0 1 2
Rated Insulation Voltage 660/600V
Ratings: AC-3, AC-4 Ie 18 A 27 A 45 A
    60 Hz 200V 3 Hp 7-1/2 Hp 10 Hp
  230V 3 Hp 7-1/2 Hp 15 Hp
460V 5 Hp 10 Hp 25 Hp
575V 5 Hp 10 Hp 25 Hp
AC Coil Data
Coil Consumption  
    AC: 50 Hz, 60 Hz, Inrush 70 VA/50 W 80 VA/60 W 130 VA/90 W
    50/60 Hz Sealed 8 VA/2.6 W 9 VA/3 W 12 VA/3.6 W
Coil Consumption ±10% 50 Hz Inrush — — —
50 Hz Sealed — — —
60 Hz Inrush — — —
60 Hz Sealed — — —
Heat Dissipation — — —
Coil Operating Limits 85…110% of related voltage
Auxiliary Contacts
NEMA Size 0…2 Auxiliary Contacts in Accessories — Cat. No. 100-S, 100-F, 100-MC
Current Switching    
        AC-1 Ith at 40 °C 10 A
  at 60 °C 6 A
        AC-15 at Rated Operating Voltage 24V/6 A, 48V/6 A, 120V/6 A, 240V/3 A, 400V/2 A, 500V/1.5 A, 600V/1.2 A, 690V/0.7 A,
        DC-13 at Rated Operating Voltage 24V/3 A, 48V/1.5 A, 125V/0.6 A, 220V/0.3 A, 440V/0.2 A
Short-Circuit Protection    
        gG Fuse Type 2 Coordination 10 A
Rated Impulse Voltage Uimp 6 kV
Insulation Voltage (between control and load circuit) per DIN,
VDE 0106, Part 101 (NAMUR recommendation) 		Between auxiliary circuits: 250V
Between load and direct-connected auxiliary circuits: 690V
Contact reliability per DIN19240 without contamination, normal industrial atmosphere 17V, 5 mA, >108 operations per error
Positively Guided Contacts Yes – N.O. and N.C. mutually unrestricted, including N.C. in relation to N.O.
Main contactor contacts do not provide positive guidance with cat. nos. 100-FL and
100-FPT.
Terminals Click to enlarge - 305_Terminal_2
Terminal Type 2 x A4
Wire Size per UL/CSA 16…12 AWG
Recommended Tightening Torque (min. …max.) 9…13 lb•in
 

NEMA Size 0 1 2
Degree of Protection
(Open Type) IEC 529 		IP20 IP20 IP20
Mechanical Life (operations in millions) 13 13 10
Maximum Number of Auxiliary Circuits 6 6 6
Operating Time – at Normal Voltage, 20 °C Pick-up AC 15…30 ms 15…30 ms 18.5…30 ms
Drop-out AC 10…60 ms 10…60 ms 10…60 ms
Maximum Operating Rates
(all contactors) 		AC-3 600
operations/hr 		600
operations/hr 		500
operations/hr
AC-4 80
operations/hr 		70
operations/hr 		60
operations/hr
Construction
Contact Material Main Contacts Silver Alloy
Auxiliary Contacts Silver
Terminal Markings NEMA and CENELEC EN50 012.
Terminal Sizes M4.0 (#8-32)
M5.0 (#10-32) 		M6.0 (1/4-20)
M8.0 (5/16-18) 		M10.0 (3/8-16)
M12.0 (1/2-13)
Terminations — Power
NEMA Size 0 1 2
Description Click to enlarge - 305_Terminal_2 ¬    Click to enlarge - 305_Terminal_1 Click to enlarge - 305_Terminal_1
Combination:
Cross, Slotted, Pozidrive 		Allen Head:
4 mm (5/32 in.)
Stranded/Solid (UL/CSA) 1 Wire #16…10 AWG #14…4 AWG #14…4 AWG
  2 Wires #16…10 AWG #14…4 AWG #14…4 AWG
Torque Requirement #13…22 lb•in #22…31 lb•in #22…31 lb•in
Terminations — Control  
Description Combination:
Cross, Slotted, Pozidrive
Coils 1 or 2 Wires #16…10 AWG
Control Modules 1 or 2 Wires #16…10 AWG
Torque Requirement #8.9…22 lb•in
Type of Protection IP 2LX per IEC 529 and DIN 40 050 (w/ wires installed)
Finger Protection Safe from touch by fingers and back of hand per VDE 0106; part 100
Environmental (Common Data) 0…2
Temperature Operation –25…+60 °C (–13…+140 °F)
  Storage –55…+80 °C (–67…+176 °F)
Altitude 2000 m per IEC 947-4
 
¬ Pozidriv No. 2 / Blade No. 3 screw

Full-Load Currents of 3-Phase, 60 Hz AC Induction Motors

The full-load currents listed below, are average values for horsepower rated motors of several manufacturers at the more commonly rated voltages and speeds. These average values, along with similar values listed in the U.S. National Electrical Code (NEC), should be used only as a guide for selecting suitable components for the motor branch circuit. The rated full-load current shown on the motor nameplate, may vary considerably from the listed value depending on the specific motor design.

ATTENTION: The motor nameplate full load current should always be used in determining the rating of the devices used for motor running overcurrent protection.

Hp RPM¬  Full Load Current [A]
208V 240V 480V 600V 2200V 4000V
1/4 3600 1.20 1.04 0.52 0.42 — —
1800 1.39 1.20 0.60 0.48 — —
1200 1.62 1.40 0.70 0.56 — —
900 — — — — — —
1/3 3600 1.48 1.28 0.64 0.51 — —
1800 1.69 1.46 0.73 0.58 — —
1200 1.89 1.64 0.82 0.66 — —
900 — — — — — —
1/2 3600 2.08 1.80 0.90 0.72 — —
1800 2.54 2.20 1.10 0.88 — —
1200 2.89 2.50 1.25 1.00 — —
900 — — — — — —
3/4 3600 2.89 2.50 1.25 1.00 — —
1800 3.47 3.00 1.50 1.20 — —
1200 3.81 3.30 1.65 1.32 — —
900 — — — — — —
1 3600 3.51 3.04 1.52 1.22 — —
1800 4.25 3.68 1.84 1.47 — —
1200 4.60 3.98 1.99 1.59 — —
900 — — — — — —
1-1/2 3600 5.04 4.36 2.18 1.74 — —
1800 5.80 5.02 2.51 2.01 — —
1200 6.49 5.62 2.81 2.25 — —
900 — — — — — —
2 3600 6.51 5.64 2.82 2.26 — —
1800 7.18 6.22 3.11 2.49 — —
1200 8.20 7.10 3.55 2.84 — —
900 — — — — — —
3 3600 9.24 8.00 4.00 3.20 — —
1800 10.4 9.04 4.52 3.62 — —
1200 11.6 10.1 5.04 4.03 — —
900 — — — — — —
5 3600 15.7 13.6 6.80 5.44 — —
1800 15.9 13.8 6.88 5.50 — —
1200 18.6 16.1 807 6.46 — —
900 — — — — — —
  
¬ Synchronous speed nameplate is usually less due to slip.

Hp RPM¬  Full Load Current [A]
208V 240V 480V 600V 2200V 4000V
7-1/2 3600 22.1 19.1 9.57 7.66 — —
1800 25.0 21.7 10.8 8.66 — —
1200 26.6 23.1 11.5 9.22 — —
900 — — — — — —
10 3600 29.7 25.7 12.9 10.3 — —
1800 31.5 27.3 3.7 10.9 — —
1200 32.9 28.4 14.2 11.4 — —
900 — — — — — —
15 3600 43.0 37.2 18.6 14.9 — —
1800 46.7 40.4 20.2 16.2 — —
1200 49.1 42.5 21.3 17.0 — —
900 — — — — — —
600 — — — — — —
20 3600 59.2 51.3 25.6 20.5 5.2 2.9
1800 59.6 51.6 25.8 20.6 5.3 3.0
1200 61.7 53.4 26.7 21.4 5.4 3.1
900 — — — — 5.8 3.2
600 — — — — 6.4 3.5
25 3600 70.9 61.4 30.7 24.6 6.3 3.4
1800 74.7 64.7 32.3 25.9 6.5 3.6
1200 76.0 65.8 32.9 26.3 6.7 3.7
900 — — — — 6.9 3.8
600 — — — — 8.1 4.4
30 3600 85.7 74.2 37.1 29.7 — —
1800 88.2 76.4 38.2 30.5 7.8 4.3
1200 91.6 79.3 39.7 31.7 8.0 4.4
900 — — — — 8.2 4.5
600 — — — — 9.3 5.0
40 3600 111 96.0 48.0 38.4 — —
1800 117 102 50.8 40.6 10.0 5.5
1200 119 103 51.7 41.4 10.3 5.7
900 — — — — 10.6 5.8
600 — — — — 11.5 6.3
  
¬ Synchronous speed nameplate is usually less due to slip.

Hp RPM¬  Full Load Current [A]
208V 240V 480V 600V 2200V 4000V
50 3600 141 122 61.2 49.0 — —
1800 144 125 62.3 49.8 12.3 6.8
1200 147 127 63.4 50.7 12.4 6.8
900 — — — — 13.1 7.2
600 — — — — 14.2 7.8
60 3600 165 143 71.6 57.3 — —
1800 172 149 74.3 59.4 14.6 8.0
1200 173 150 74.9 59.9 14.9 8.2
900 — — — — 15.4 8.5
600 — — — — 16.7 9.2
75 3600 204 177 88.5 70.8 — —
1800 211 183 91.4 73.1 18.0 9.9
1200 215 186 93.1 74.5 18.2 10.0
900 — — — — 19.0 10.5
600 — — — — 21.0 11.6
100 3600 267 231 116 92.6 — —
1800 276 239 119 95.5 23.6 13.0
1200 281 243 122 97.2 24.2 13.3
900 — — — — 24.8 13.6
600 — — — — 26.4 14.5
450 — — — — 29.8 16.4
125 3600 333 288 144 115 — —
1800 340 294 147 118 29.2 16.1
1200 347 300 150 120 29.9 16.4
900 — — — — 30.9 17.0
720 — — — — 31.3 17.2
600 — — — — 32.8 18.0
450 — — — 138 36.0 19.8
150 3600 397 344 172 140 — —
1800 404 350 175 143 34.8 19.1
1200 414 358 179 — 35.5 19.5
900 — — — — 37.0 20.4
720 — — — — 37.0 20.4
600 — — — — 38.8 21.3
450 — — — — 42.0 23.1
  
¬ Synchronous speed nameplate is usually less due to slip.

Hp RPM¬  Full Load Current [A]
208V 240V 480V 600V 2200V 4000V
200 3600 524 454 227 182 — —
1800 531 460 230 184 46.7 25.7
1200 538 466 233 186 47.0 25.9
900 — — — — 49.4 27.2
720 — — — — 49.0 27.0
600 — — — — 50.9 28.0
450 — — — — 53.7 29.5
250 3600 642 556 278 222 — —
1800 658 570 285 228 57.5 31.6
1200 682 590 295 236 58.5 32.2
900 — — — — 61.5 33.8
720 — — — — 61.5 33.8
600 — — — — 61.0 33.6
450 — — — — 65.3 35.9
360 — — — — 70.0 38.5
300 3600 774 670 335 268 — —
1800 790 684 342 274 69.0 38.0
1200 804 696 348 278 70.0 38.5
900 — — — — 73.5 40.4
600 — — — — 72.3 39.8
450 — — — — 76.0 41.8
360 — — — — 82.8 45.5
350 3600 — 748 374 299 — —
1800 — 762 381 305 — —
1200 — 774 387 310 — —
400 3600 — 874 437 350 — —
1800 — 892 446 357 — —
1200 — 902 451 361 — —
450 3600 — 972 486 389 — —
1800 — 992 496 397 — —
1200 — 1004 502 402 — —
500 3600 — 1074 537 430 — —
1800 — 1096 548 438 — —
1200 — 1108 554 443 — —
  
¬ Synchronous speed nameplate is usually less due to slip.