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Marathon C328B

Marathon · Explosion Proof NEMA Premium Efficiency Blue Chip Series Hazardous Duty
20 HP 1775 256TC TEFC-XP 230V|460V Explosion Proof
Catalog Number: C328B
Model Number: 256TTGN16034
HP
20
RPM
1800
Voltage
230V,460V
Frame
256TC
Phase
3
Enclosure
TEFC-XP
Material
Cast Iron
Mounting
C-Face / Round Body

Product-line overview

Marathon’s line of explosion proof motors is designed to protect against contamination that could lead to an explosion and to internally contain an explosion if it were to happen. They are the right choice for your severe duty applications in hazardous locations across various industries.

Availability: Factory Order

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Cross-Referenced Matches (1)

Equivalent alternatives from other brands that have matching specifications to this product.

Marathon: Explosion Proof NEMA Premium Efficiency Blue Chip Series Hazardous Duty (99)

C303B33525230V, 460V182TC $1,008.94
C324B51755230V, 460V184TC $1,031.55
C304B53495230V, 460V184TC $1,059.96
U062B7 1/23525230V, 460V213T $1,334.23
C305B7 1/23525230V, 460V213TC $1,394.54
U063B103520230V, 460V215T $1,399.76
U991B7 1/21765230V, 460V213T $1,537.76
U025B7 1/21765575V213T $1,537.76
U006B7 1/21765230V, 460V213T $1,537.76
U043B51170230V, 460V215T $1,539.50
C306B103520230V, 460V215TC $1,575.45
C325C7 1/21765230V, 460V213TC $1,598.07
U992B101765230V, 460V215T $1,618.95
U026B101765575V215T $1,618.95
U007B101765230V, 460V215T $1,618.95
C370B7 1/21765575V213TC $1,618.95
C366B7 1/21765230V, 460V213TC $1,618.95
U991B-P7 1/21765208-230V, 460V213T $1,683.89
C367B101765230V, 460V215TC $1,700.13
C326B101765230V, 460V215TC $1,794.64
C307B153535230V, 460V254TC $2,161.69
C327B151775230V, 460V254TC $2,239.39
C328B201775230V, 460V256TC $2,526.99
C308B203537230V, 460V256TC $2,587.87
E547A251800230V, 460V284T $3,465.36
U032A501800575V326T $5,305.63
U080A601800230V, 460V364TS $8,479.74
U033A601800575V364T $8,479.74
E573A601800230V, 460V364T $8,479.74
U034A751800575V365T $9,019.00
E576A751800230V, 460V365T $9,019.00
E571501200230V, 460V365T $9,076.98
E575753600230V, 460V365TS $9,148.31
E5781003600230V, 460V405TS $10,538.21
E574601200230V, 460V404T $10,697.67
E577751200230V, 460V405T $11,216.63
U082A1001800230V, 460V405TS $11,516.42
U035A1001800575V405T $11,516.42
U073A1253600460V444TS $15,560.64
E582A1251800460V444T $15,623.90
E580A1001200230V, 460V444T $16,462.00
E5831251200460V445T $16,857.82
U084A1501800460V445TS $16,872.94
U090A1501200460V445T $21,772.24
U038A2001800575V445T $23,009.52
E5882001800460V445T $23,009.52
E595A2503575460V447TS, 449TS $24,361.58
E5912501800460V449T $26,458.80
E5963001785460V447T, 449T $33,317.59
H504A3501785460V447T, 449T $41,658.33

Feature

  • “Blue Chip®” thermal protection
  • Thermal protection, 56 frame auto overload, 143-256TC T-stats
  • Conduit box shipped loose on 56 frame, installed on 143-256TC
  • 56 frame class I, groups C & D, class II, groups F & G
  • 143-256TC class I, group D, group C as noted, class II, groups F & G
  • T3B temperature code
  • UL file # E12044
  • CSA file #LR47504
Electrical Data
Rated Motor Output Power
20 HP
15 kW
Rated Motor Speed
1775 RPM
Rated Motor Voltage
230V,460V
Rated Motor Current
48.0/24.1 AMP
Phase
3
Poles
4
Locked Rotor Current
-
Fl Current @ 208V
-
Service Factor
1
KVA Code
G
Nominal Efficiency
93
Nominal Power Factor
84
Leads (Qty, Size)
-
Frequency
60 Hz
Connection
-
Start Capacitor
-
Run Capacitor
-
MFD
-
VFD (S.F. 1.0)
Ratio
Hz
Variable Torque
-
-
Constant Torque
-
-
General Data
Frame
256TC
Enclosure
TEFC-XP
Mounting
C-Face / Round Body
Number of Speeds
-
Approximate Weight
441lb
Double Drilled
No
Frame Material
Cast Iron
C-Dimension
25.77"
NEMA Design
B
Degree of Protection (IP)
IP54
Insulation Class
F
Rotation
Reversible
Duty
Continuous
Conduit Box Location
-
Removable Feet
No
Orientation
Horizontal
Ambient Temp
40°C
Full Load Temperature Rise
Full Load Temp Rise
-
Temp Code
T3B
Mechanical Data
DE Bearing
6210
NDE Bearing
6210
Shaft Diameter
1.625"
Shaft Length
3.75"
Grease Type
-
Greaseable
No
Hazardous Locations
CSA Certified
-
Temp Code (Sine Wave Power)
-
Temp Code (VFD Power)
-
Additional Information
Agency Approvals
CSA
Country of Origin
USA
Warranty
3-Year

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About Marathon

With decades of proven reliability, Marathon Motors is a leading name in industrial electric motors, delivering solutions for HVAC, manufacturing, and oil & gas industries across the United States. Their extensive product lineup includes both NEMA and IEC standard motors, ensuring consistent performance and compatibility across your operations, whether you’re retrofitting equipment or standardizing across multiple facilities.

In 2024, Marathon Motors entered an exciting new chapter when it was acquired by WEG Motors, one of the world’s largest and most innovative motor manufacturers. This acquisition allows Marathon to leverage WEG’s global expertise, cutting-edge manufacturing, and expanded distribution network, while continuing to uphold the quality, reliability, and technical support that U.S. customers have trusted for decades.

Marathon products are built with rigorous quality control standards, delivering durability and long service life even in the most demanding industrial environments. And with expert technical support available from a team deeply familiar with both Marathon and WEG products, American businesses can source motors with confidence, knowing they’ll receive guidance on product selection, installation, and maintenance.

Whether you’re sourcing replacement motors, high-performance industrial motors, or specialized IEC/NEMA models, Marathon Motors under WEG offers extensive inventory and excellent product expertise, making it easier than ever for companies to keep operations running smoothly.

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