US: +1 (941) 473-0073
International: +1 (866) 595-9616
sales@kmparts.com
Searching...

Eaton Molded Case Circuit Breaker Series-C, M-Frame

M-Frame (300–800 Amperes)

Product Description

  • All Eaton M-Frame circuit breakers are HACR rated
  • MDL-Frame circuit breakers are available as individual components (frame, trip unit, terminals), or factory assembled complete breakers
  • MDLB, HMDLB-Frame circuit breakers with noninterchangeable trip units are suitable for reverse feed use

Standards and Certifications

  • CE marked

Types MDL and HMDL Thermal-Magnetic Circuit Breakers with Interchangeable Trip Units—Two-Pole

Maximum
Continuous
Ampere
Rating
at 40°C 		Standard Interrupting Capacity
600 Vac Rated 50 kAIC at 480 Vac 		High Interrupting Capacity
600 Vac Rated 65 kAIC at 480 Vac 		Thermal-Magnetic
Trip Unit Only
For Use with Standard
or High or Ultra High
Interrupting Frames 		Standard
Terminals
Only (1)
Factory Assembled
Circuit Consisting
of Frame, Trip Unit
and Terminals 		Frame Only Factory Assembled
Circuit Consisting
of Frame, Trip Unit
and Terminals 		Frame Only Magnetic Trip Range
is 5–10 Up Through
600A; 4–8 on 700 and
800A x Continuous
Ampere Rating
300 MDL2300 MDL2800F HMDL2300 HMDL2800F MT2300T TA700MA1
350 MDL2350 HMDL2350 MT2350T TA700MA1
400 MDL2400 HMDL2400 MT2400T TA700MA1
450 MDL2450 HMDL2450 MT2450T TA700MA1
500 MDL2500 HMDL2500 MT2500T TA700MA1
600 MDL2600 HMDL2600 MT2600T TA700MA1
700 MDL2700 HMDL2700 MT2700T TA700MA1
800 MDL2800 HMDL2800 MT2800T TA800MA2

Types MDL and HMDL Thermal-Magnetic Circuit Breakers with Interchangeable Trip Units—Three-Pole

Maximum
Continuous
Ampere
Rating
at 40°C 		Standard Interrupting Capacity
600 Vac Rated 50 kAIC at 480 Vac 		High Interrupting Capacity
600 Vac Rated 65 kAIC at 480 Vac 		Thermal-Magnetic
Trip Unit Only
For Use with Standard
or High or Ultra High
Interrupting Frames 		Standard
Terminals
Only (1)
Factory Assembled
Circuit Consisting
of Frame, Trip Unit
and Terminals 		Frame Only Factory Assembled
Circuit Consisting
of Frame, Trip Unit
and Terminals 		Frame Only Magnetic Trip Range
is 5–10 Up Through
600A; 4–8 on 700 and
800A x Continuous
Ampere Rating
300 MDL3300 MDL3800F HMDL3300 HMDL3800F MT3300T TA700MA1
350 MDL3350 HMDL3350 MT3350T TA700MA1
400 MDL3400 HMDL3400 MT3400T TA700MA1
450 MDL3450 HMDL3450 MT3450T TA700MA1
500 MDL3500 HMDL3500 MT3500T TA700MA1
600 MDL3600 HMDL3600 MT3600T TA700MA1
700 MDL3700 HMDL3700 MT3700T TA700MA1
800 MDL3800 HMDL3800 MT3800T TA800MA2

NOTES:
(1) Two terminals are required per pole.

Types MDLB and HMDLB Thermal-Magnetic Circuit Breakers with Non-Interchangeable Trip Units—Two-Pole (1)

Maximum
Continuous
Ampere
Rating
at 40°C 		Standard Interrupting Capacity
600 Vac Rated 50 kAIC at 480 Vac

Factory Assembled Circuit Consisting
of Frame, Trip Unit and Terminals 		High Interrupting Capacity
600 Vac Rated 65 kAIC at 480 Vac

Factory Assembled Circuit Consisting
of Frame, Trip Unit and Terminals 		Standard
Terminals Only (2)
300 MDLB2300 HMDLB2300 TA700MA1
350 MDLB2350 HMDLB2350 TA700MA1
400 MDLB2400 HMDLB2400 TA700MA1
450 MDLB2450 HMDLB2450 TA700MA1
500 MDLB2500 HMDLB2500 TA700MA1
600 MDLB2600 HMDLB2600 TA700MA1
700 MDLB2700 HMDLB2700 TA700MA1
800 MDLB2800 HMDLB2800 TA800MA2

Types MDLB and HMDLB Thermal-Magnetic Circuit Breakers with Non-Interchangeable Trip Units—Three-Pole (1)

Maximum
Continuous
Ampere
Rating
at 40°C 		Standard Interrupting Capacity
600 Vac Rated 50 kAIC at 480 Vac

Factory Assembled Circuit Consisting
of Frame, Trip Unit and Terminals 		High Interrupting Capacity
600 Vac Rated 65 kAIC at 480 Vac

Factory Assembled Circuit Consisting
of Frame, Trip Unit and Terminals 		Standard
Terminals Only (2)
300 MDLB3300 HMDLB3300 TA700MA1
350 MDLB3350 HMDLB3350 TA700MA1
400 MDLB3400 HMDLB3400 TA700MA1
450 MDLB3450 HMDLB3450 TA700MA1
500 MDLB3500 HMDLB3500 TA700MA1
600 MDLB3600 HMDLB3600 TA700MA1
700 MDLB3700 HMDLB3700 TA700MA1
800 MDLB3800 HMDLB3800 TA800MA2

NOTES:
(1) Factory sealed for reverse feed application.
(2) Two terminals are required per pole.

Types MDL and HMDL Electronic Circuit Breakers with Interchangeable Trip Units—Three-Pole

Maximum
Continuous
Ampere
Rating
at 40°C (1) 		Circuit Breaker Frame Only Digitrip RMS 310 Trip Unit Only Digitrip RMS 310 Rating Plug Only
Standard
Interrupting
Capacity 600
Vac
Rated 50 kAIC
at 480 Vac 		High Interrupting
Capacity 600 Vac
Rated 65 kAIC
at 480 Vac 		L – Adjustable Long Delay Pickup (by Adjustable Rating Plug)
S – Adjustable Short Delay Pickup with Fixed Short Delay Time
(I2t Response) or Adjustable Short Delay Time (Flat Response)
I – Adjustable Instantaneous Pickup by Setting Short Delay Time
to Instantaneous
G – Adjustable Ground Fault Pickup with Adjustable Ground Fault
Delay (Flat Response) 		Ampere
Rating 		Fixed
Rating
Plug 		Ampere Rating
800 MDL3800F HMDL3800F MES3800LS 400 8MES400T 400/500/600/800
A8MES800T
MES3800LSI 500 8MES500T
MES3800LSG 600 8MES600T 620/640/660/680
A8MES600T5
MES3800LSIG 700 8MES700T
— 800 8MES800T 720/740/760/780
A8MES700T5

Types MDLB and HMDLB Electronic Circuit Breakers with Non-Interchangeable Trip Units (3)

Maximum
Continuous
Ampere
Rating
at 40°C (1) 		Factory-Assembled Circuit Breaker Consisting of Frame and Trip Unit
LS LSI LSG LSIG
Three-Pole Standard Interrupting Capacity 600 Vac Rated 50 kAIC at 480 Vac
800 MDLB3800T33W MDLB3800T32W MDLB3800T35W MDLB3800T36W
Three-Pole High Interrupting Capacity 600 Vac Rated 65 kAIC at 480 Vac
800 HMDLB3800T33W HMDLB3800T32W HMDLB3800T35W HMDLB3800T36W

NOTES:
(1) Ampere rating is established by rating plug.
(2) For AC use only.
(3) Factory sealed, suitable for reverse feed application. CMDLB and CHMDLB are also available.

100% Rated Types CMDL and CHMDL Electronic Circuit Breakers with Interchangeable Trip Units—Three-Pole

The NEC allows the breaker to be rated at 100% of its frame size in an assembly, provided that 90°C wire is applied at the 75°C ampacity. All 100% rated circuit breakers have electronic trip units. Order as individual components: breaker frame, trip unit, rating plug and terminals.

Maximum
Continuous
Ampere
Rating
at 40°C (1) 		Circuit Breaker Frame Only Digitrip RMS 310 Trip Unit Only Digitrip RMS 310 Trip Unit Only
Standard
Interrupting
Capacity
50 kAIC at
480 Vac 		High
Interrupting
Capacity
65 kAIC at
480 Vac 		Standard
Adjustable
Short Time
Pickup with
I 2 t Short
Delay Ramp 		Options
Independently
Adjustable
Short Time
Pickup and
Delay
Ground
Fault
Protection 		Adjustable
Short Time
Pickup with
I 2 t Short
Delay and
Ground Fault
Protection 		Independently
Adjustable
Short Time
Pickup and
Ground Fault
Protection 		Ampere
Rating 		Ampere
Rating 		Adjustable
Rating Plug

Ampere
Rating
800 CMDL3800F CHMDL3800F MES3800LS MES3800LSI MES3800LSG MES3800LSIG 400 8MES400T 400/500/600/800
A8MES800T
500 8MES500T
600 8MES600T 620/640/660/680
A8MES600T5
700 8MES700T
800 8MES800T 720/740/760/780
A8MES700T5

Molded Case Switches

Eaton’s molded case switches are used as compact switches in applications requiring high current switching capabilities. Molded case switches are constructed of circuit breaker components and are of the high instantaneous automatic type. Molded case switchesare listed in accordance with Underwriters Laboratories Standard UL 489.

Maximum
Continuous
Ampere
Rating
at 40°C 		600 Vac Maximum, 250 Vdc
Circuit Breaker Only without
Line and Load Terminals
Two-Pole
800 MDL2800WK
MDLB2800WK (3)
HMDLB2800WK
Three-Pole
800 MDL3800WK
MDLB3800WK (3)
HMDL3800WK

NOTES:
(1) Ampere rating is established by rating plug.
(2) For AC use only.
(3) MDLB and HMDLB are suitable for reverse feed applications.
Molded case switch may trip above 6000 amperes.

Accessories Selection Guide and Ordering Information

Line and Load Terminals

M-Frame circuit breakers use Cu/AI terminals as standard. When optional copper or Cu/ AI terminals are required, order by catalog number. Specify if factory installation is required.

TA700MA1 TA800MA2 TA801MA

Line and Load Terminals

Maximum
Breaker
Amperes 		Terminal
Body
Material 		Wire
Type 		AWG Wire
Range/No.
Conductors 		Terminal Terminals with Control
Wire Termination
Standard Cu/AI Pressure Terminals
700 Aluminum Cu/AI 1–500 kcmil (2) TA700MA1 TA700MA1CWT
800 std. Aluminum Cu/AI 3/0–400 kcmil (3) TA800MA2 TA800MA2CWT
800 Aluminum Cu/AI 500–750 kcmil (2) TA801MA TA801MACWT
Optional Copper and Cu/AI Pressure Type Terminals
600 Copper Cu 2/0–500 kcmil (2) T600MA1 —
800 Copper Cu 3/0–300 kcmil (3) T800MA1 —

© 2025 KMParts - All Rights Reserved | Privacy Policy