MA- Series
Three Phase Adjustable Trip
Miniature Circuit Breakers/
Manual Motor Controllers
UL508 listed
E137938
CAN/CSA-C22.2 No.14 certified
The MA was designed to handle the high
inrush loads of 3 phase transformers,
power supplies, motors, etc. The MA
protects wiring and equipment from
damage caused by the three major
classes of over-current, yet greatly reduc-
es the number of nuisance trips in high
Type Designation
MA RT
starting and inrush current circuits.
__ __
__
__
An IEC device with excellent ratings under
a UL listing at 480Y/277V (including group
ratings) and at 500V under international
standards, the Altech/ABL Sursum MA
provides short and long term cost effective
circuit protection for USA and/or export
applications. The short term advantages
include: (1) adjustable thermal trip allows
finalization of initial designs before
procurement of the load equipment is
complete; (2) snap-on mounting for readily
available, internationally standardized DIN
Rail saves panel layout design time as well
as installation and change labor; (3) large
cage-clamp terminals with screws suitable
to power screwdrivers, simplifies and
speeds wiring; (4) convenient switched
disconnect during factory testing and/or
initial start-up saves time and aggravation.
The key long term advantage is customer
satisfaction and proven over-current pro-
tection of wiring and equipment (and the
lack of rework/repair costs).
(a) (b) (c) (d)
(a) = MA - Manual Motor Controller
(b) = Rated Current
(c) = U - US Housing
(d) = Blank - Standard Terminal
RT - Ring-tongue Terminal
Voltage Rating
480Y/277VAC
0.16A-2.5A: 42kA; 4.0A-16A: 14kA; 20A-40A: 10kA
AIC (Interrupt Capacity)
Standard Short Circuit Withstand Rating 0.16A-2.5A: 42kA; 4.0A-16A: 14kA
(UL/CSA Ratings)
Group Short Circuit Ratings
(UL/CSA Ratings)
see above
Typical Life
6000 on/off operations with 2xRC
25°C, +0°, -5° (77°F, +0° -9°)
1/450g (1.0 lb.)
Calibration Temperature
Standard Pack and Weight
Terminal Size Acceptability
Top/Bottom: 18-3 AWG
GROUP SHORT
CIRCUIT RATING
AT 480VAC
3Ø HORSEPOWER RATINGS AT NOMINAL LINE VOLTAGE
(See Note for HEA Definition)
Type and
Rated
Current
FLA Dial
Adjustment
Markings
a
460-480V
HP (HEA)
110-120V
HP (HEA)
200V
208V
220-240V
HP (HEA)
(and BCP size)
Cat. No.
HP (HEA) HP (HEA)
MA0.16U
MA0.25U
MA0.40U
MA0.63U
MA1.0U
MA1.6U
MA2.5U
MA4.0U
MA6.3U
MA10U
MA16U
MA20U
MA25U
MA32U
MA40U
15.901U
15.902U
15.903U
15.904U
15.905U
15.906U
15.907U
15.908U
15.909U
15.910U
15.911U
15.912U
15.913U
15.914U
15.915U
0.1/ 0.12/0.14/0.16
0.16/0.19/0.22/0.25
0.25/0.30/0.35/0.40
0.40/0.48/0.56/0.63
0.63/0.75/0.87/1.0
1.0/1.2/1.4/1.6
1.6/1.9/2.2/2.5
2.5/3.0/3.5/4.0
4.0/4.8/5.6/6.3
6.3/7.5/8.7/10
42kARMS
Through MA2.5U, ampere rated for motor circuits having a full-
load-amperage (FLA) not exceeding the MA’s general purpose
rated current (RC, equals maximum dial setting) and a locked
rotor current not exceeding 6 times the MA’s RC.
symmetrical
(max. 1200A
MCCB
or RK5)
14kARMS
1/2 (4.0) 3/4 (3.2)
3/4 (5.6) 11/2 (6.0)
3/4
11/2
2
(3.1)
(5.7)
1
(3.6)
2
3
5
(3.42)
(4.8)
(7.6)
symmetrical
(max. 350A
MCCB
11/2 (5.2)
1
2
3
3
5
5
(7.2)
(13.6)
(19.2)
(19.2)
2
3
5
5
(7.8)
(11.0)
(17.5)
(7.5)
3
5
5
(9.6)
10/12/14/16
or RK5)
3
(10.6)
(16.7)
(15.2) 10 (14.0)
(15.2) 10 (14.0)
10kARMS
16/17/18.5/20
5
symmetrical
(max. 350A
MCCB
20/21.5/23/25
(17.5) 71/2 (24.2) 71/2 (22.0) 15 (21.0)
25/27/30/32
(30.4) 71/2 (25.0) 71/2 (24.2)
(30.4) 10 (32.0) 10 (31.0)
10 (28.0) 20 (27.0)
10 (28.0) 25 (34.0)
32/34/37/40
or RK5)
Note: HEA - Horsepower Equivalent Amperes, the nominal amperage assigned to standard motor horsepower ratings in design guide tables such as
NFPA-70 Tables 430-248, 430-249, 430-250; UL1077 Table 16.2; CSA - C22.2 No. 235-M89 Tables 44 and 45; CSA-C22.2 No. 14-M91 Table 19, etc. Multiply
HEA values (in parenthesis) by 1.1 if power factor is 90%, and by 1.2 if power factor is 80%.
a
The standard-circuit short-circuit rating is 14kA for all types. Group ratings can be used in a standard circuit (e.g., MA1.0U at 42kA), but a higher
standard rating cannot be used in a group circuit (e.g., MA40U at 14kA only in standard circuit.)
Altech Corp.® • 35 Royal Road • Flemington, NJ 08822-6000 • Phone (908)806-9400 • FAX (908)806-9490 • www.altechcorp.com
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