A 23
Bulletin No. 8660PD9501
November, 1996
Raleigh, NC, USA
Product Data Bulletin
Class 8660 Solid State Reduced Voltage Starters
Reduced Availability Guide

Cross Reference Data
INTRODUCTION
On October 16, 1995, Class 8660 Solid State Reduced Voltage Starters will enter the
“Reduced Availability” phase. At this time, Class 8660 devices should not be
recommended for new applications. Class 8660 devices will be replaced by:
• ALTISTART 23 open style soft start devices
• Class 8638 and Class 8998 enclosed ALTISTART devices
This bulletin is a cross reference guide between the Telemecanique ALTISTART 23
(ATS23) devices and the Square D Class 8660 solid state reduced voltage starters.
• Table 1 compares features and Table 2 is a catalog number cross reference for open
style ATS23 and Class 8660 soft starts.
• Table 3 compares features and Table 4 is a catalog number cross reference for
enclosed Class 8638 combination ALTISTART and Class 8660 soft starts.
Class 8660 soft starts will not be available for sale after April 16, 1996. However,
repair parts and service will be available for installed products until the
requirements dictate full obsolescence of the Class 8660 product line.
OPEN STYLE SOFT
STARTS
In comparison with the Class 8660 open style soft starts, please note the following
differences:
• The primary consideration in selecting an ATS23 device is the motor full load
amperage. ATS23 soft starts are available in 14 different amp ratings. All devices
can be configured for 200, 230, 380 or 460 VAC motors and are self adjusting for
50 or 60 Hz.
• Class 8660 open style soft starts are specified by Class/Type/Form. The 3rd digit
of the type number is “O”. ALTISTART 23 catalog numbers begin with “ATS23”.
• Open style ATS23 soft starts are manufactured by Telemecanique in France. All
units are stocked in the warehouse. As such, open style ATS23 soft starts are not
available with any additional factory modifications.
Table 1: Open Style Soft Starts – Feature Comparison
Features
Class 8660
ALPHA-PAK
SSRVS
ALTISTART 23
Standard Version
Current Limit
150% to 425%
150% to 425%
200% to 500%
Voltage Ramp
Standard
0.5 to 30 seconds
Optional
3 to 30 seconds
Standard
1 to 30 seconds
"Boost" Start
N/A
N/A
Standard
Decel Ramp
N/A
Optional
3 to 30 seconds
Standard
2 to 60 seconds
DC Braking
N/A
N/A
Standard
2 to 60 seconds
Solid State Overload
Standard
Standard
Standard
Max. hp @ 460 VAC
100 hp
600 hp
1000 hp
Max. Motor Voltage
575 VAC
575 VAC
460 VAC
• For a more detailed comparison of features and specifications, refer to Digest 170, page 12-75.
• SSRVS = Solid State Reduced Voltage Starter.
 1995 Square D All Rights Reserved
1
Soft Starts Cross Reference
Class 8660 → ALTISTART
Bulletin No. 8660PD9501
November, 1996
Table 2: Open Style Soft Starts – Catalog Number Cross Reference
Class 8660 Type
hp @ 460 VAC
ENCLOSED SOFT
STARTS
ALPHA-PAK
SSRVS
ALTISTART 23
Catalog Number
(standard version)
5
MDO46
—
ATS23U70N
7.5
MDO46
—
ATS23D12N
10
MDO46
—
ATS23D16N
20
MEO46
—
ATS23D30N
30
MFO46
—
ATS23D44N
40
MFO46
—
ATS23D72N
50
MGO46
MGO22
ATS23D72N
75
MGO46
MGO22
ATS23C10N
100
MGO46
MHO22
ATS23C15N
150
—
MHO22
ATS23C24N
200
—
MJO22
ATS23C24N
250
—
MJO22
ATS23C30N
350
—
MKO22
ATS23C41N
400
—
MKO22
ATS23C58N
500
—
MMO22
ATS23C58N
600
—
MMO22
ATS23C82N
When ordering a Class 8638 enclosed ALTISTART
device, please note the following
differences and similarities to other Square D motor control products:
• Class 8638 devices are combination devices with a fusible disconnect switch,
similar to Class 8538 combination starters. Square D enclosed ALTISTART
devices utilize either a shunt trip coil on the molded case switch or an isolation
contactor to provide automatic disconnect of the motor if a shorted SCR is
detected. As such, non-combination devices are not available.
• Similar to the Class 8660 product line, the 3rd digit of the type number of Class
8638 enclosed ALTISTART devices indicates the enclosure type is NEMA 12.
Class 8638 devices are only available in a NEMA Type 12 enclosure and should
be recommended for both NEMA type 1 and 12 applications.
• A control power transformer (CPT) is provided as standard in all Class 8638
devices for 120 VAC control logic. (A Form and price adder was required to
include a CPT in Class 8660 devices.) Additional VA for customer use can be
ordered by Form with Class 8638 devices.
• Standard Class 8638 enclosed ALTISTART devices are available through 400 hp.
For applications up to 1000 hp, Class 8638 style combination soft starts are
available. Contact your local Drives Specialist for quotation assistance.
• ALTISTART devices are also available in a NEMA 1 or 12 MCC enclosure. Class
8998 enclosed ALTISTART products are also combination devices, available in
configurations similar to Class 8638 enclosed ALTISTART devices. Please refer to
the “Q/To” or “Quote To Cash” product selector for ordering information.
2
 1995 Square D All Rights Reserved
Bulletin No. 8660PD9501
November, 1996
Soft Starts Cross Reference
Class 8660 → ALTISTART
Table 3: Enclosed Soft Starts – Feature Comparison
Class 8660
Features
ALPHA-PAK
SSRVS
Class 8638
ALTISTART
Standard Version
SCR Fault Isolation
Optional
Form Y79•
Optional
Form Z79•
Standard
Shorting Contactor
Not Available
Optional
Form Z20
Standard
30 hp and above
Control Power
Transformer (CPT)
Optional
Form FF4T40
Optional
Form FF4T40
Standard
120 VAC CPT
• SSRVS = Solid State Reduced Voltage Starter.
Table 4: Enclosed Soft Starts – Catalog Number Cross Reference
Class 8660 Type/Form
Class 8638 Type
Non-Comb. Starter
NEMA 12 Enclosure,
Comb. Starter
NEMA 12 Enclosure,
Comb. Starter w/
Shunt Trip Coil
5
MDG46
MDA46 FF4T40 Y793
PBA4S
7.5
MDG46
MDA46 FF4T40 Y793
PCA4S
10
MDG46
MDA46 FF4T40 Y793
PDA4S
20
MEG46
MEA46 FF4T40 Y794
PFA4S
30
MFG46
MFA46 FF4T40 Y795
PHA4S
hp @ 460 VAC NEMA 1 Enclosure,
40
MFG46
MFA46 FF4T40 Y795
PJA4S
50
MGG46
MGA46 FF4T40 Y795
PJA4S
75
MGG46
MGA46 FF4T40 Y796
PLA4S
100
MGG46
MGA46 FF4T40 Y796
PMA4S
150
MHG22
MHA22 FF4T40 Z796
PPA4S
200
MJG22
MJA22 FF4T40 Z797
PPA4S
250
MJG22
MJA22 FF4T40 Z798
PQA4S
350
MKG22
MKA22 FF4T40 Z798
PSA4S
400
MKG22
MKA22 FF4T40 Z799
PTA4S
500
MMG22
MMA22 FF4T40 Z799
Consult Factory
600
MMG22
MMA22 FF4T40 Z799
Consult Factory
 1995 Square D All Rights Reserved
3
Soft Starts Cross Reference
Class 8660 → ALTISTART
A
Bulletin No. 8660PD9501
November, 1996
ALPHA-PAK is a registered trademark of Square D Company.
4
is a registered trademark of Telemecanique or its successor-in-interest, Schneider Electric, S.A.
 1995 Square D All Rights Reserved