Cutler Hammer, Div of Eaton Corp A307, A308, A309 General Product Line Information
IEC Contactors & Starters
Freedom MMPs & Manual and Combination Motor Controllers
Types A307, A308, A309 Manual Motor Protectors
March 2009
34
Contents
Description Page
Manual Motor Protectors
Product Description. . . . . . . 34-294
Application Description. . . . 34-294
Features . . . . . . . . . . . . . . . . 34-294
Standards and
Certifications . . . . . . . . . . . 34-294
Instructional Leaflets . . . . . . 34-294
Product Selection . . . . . . . . 34-295
Accessories . . . . . . . . . . . . . 34-297
Note: For more information, see
CA03801001E.
A307, A308 and A309
Manual Motor Protectors
Product Description
The Cutler-Hammer® A307, A308 and
A309 family of Manual Motor Protectors (MMPs) from Eaton’s electrical
business feature a rotary ON/OFF
manual disconnect, Class 10 adjustable bimetallic overload relay and
fixed magnetic short circuit trip capability in one compact unit. Three
frame sizes are available: A307 (45 mm)
for motors with FLA ratings up to 25A,
A308 (55 mm) covers motor FLA ratings
up to 50A and the A309 (70 mm) is suitable for motor FLA ratings to 100A.
Application Description
The A307, A308 and A309 MMPs can
be used in the following applications:
Manual Motor Protectors
All of the MMPs are UL Listed under
UL508 as Manual Motor Controllers.
They provide an economical solution
for applications requiring simple manual starting and stopping of motors.
When used as an MMP, they are
typically installed in an enclosure.
IP55 enclosures are offered as accessories for the MMPs. Separate shortcircuit protective devices, such as
circuit breakers or fuses, are wired
ahead of the MMPs. The short-circuit
protective device should be sized per
the NEC code and should not exceed
400% of the maximum FLA dial setting
of the MMP.
Group Motor Installations
A Group Motor Installation can be
defined as more than one motor circuit
protected by a single set of fuses or circuit breaker on a motor branch circuit.
This eliminates the need for individual
fuses or circuit breakers for each
motor circuit. Substantial component
cost savings, panel space savings and
reduced wiring installation time can be
achieved in Group Motor Installations.
Table 34-384. Short Circuit Ratings
Description Specification
UL 508 Type E
Manual Combination Starter/Motor Controller
A307
A308
A309
See Pages 34-295 – 34-296 for individual
ratings.
65 kA @ 240V, 480Y/277V
30 kA @ 600Y/347V up to 12.5A
65 kA @ 240V, 480Y/277V
25 kA @ 600Y/347V
65 kA @ 240V, 480Y/277V
30 kA @ 600Y/347V up to 75A
Features
■ ON/OFF Rotary Handle with Lockout
Provision
■ Visible Trip Indication
■ Class 10 Overload Protection
■ Phase Loss Sensitivity
■ Ambient Temperature Compensation
to 140°F
■ Fixed Short Circuit Trip — 13 times
maximum setting of overload FLA
dial
■ Type 2 Coordination per IEC 947
■ Identification Markers Standard on
Starter Faceplate
■ Motor Applications from 0.11A to
100A
■ Built-in heater and magnetic trip
elements to protect the motor
■ Adjustment dial for setting motor
FLA
■ DIN Rail or Panel Mount
■ Accessories include:
❑ Front and Side Auxiliary Contacts
❑ Trip Indicating Contacts
❑ Tamperproof Cover for OLR Dial
❑ Undervoltage Release
❑ Shunt Trip
❑ Thru-the-Door Operators
❑ Enclosures
❑ 3-Phase Line Side Connecting
Links
Standards and Certifications
■ UL File No. E176513, Category NKJH
(A307, A308, A309)
UL File No. E37317, Category NKCR
(Accessories)
■ CSA File LR12530, Class 3211-05
■ IEC 947-1; IEC 947-2; IEC947-4-1
■ DIN VDE 0660 Part 100, Part 101 and
Part 102
Instructional Leaflets
IL49490 — A307 Manual Motor
Protectors
IL49491 — A308 Manual Motor
Protectors
IL49492 — A309 Manual Motor
Protectors
IL49493 — C320TR11 Trip Indicating
Contacts
IL49494 — IP55 Enclosures and Front
Plates
IL49495 — C320HN Thru-the-Door
Operators
IL49496 — Indicating Lights
See Application Note — AP03402001E.
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