Technical Data · Publication 140M-TD002 · Rockwell Automation
Bulletin 140M — Technical Data (140M-TD002)
Complete specifications, ratings, and catalog selection data for the Allen-Bradley Bulletin 140M family of Motor Protection Circuit Breakers (MPCBs) and Motor Circuit Protectors (MCPs) in C, D, and F frames — 0.1…45 A, UL Listed as Manual Type E Self-Protected Combination Motor Controllers. Mirrored from Rockwell Automation Publication 140M-TD002.
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Specifications
Electrical Ratings
| Rated operational current (Ie) | 0.1 – 45 A across C/D/F frames (20 discrete adjustment ranges) |
|---|---|
| Maximum 3-phase voltage | Up to 690 V AC (AC-3 ratings at 230 / 400-415 / 500 / 690 V) |
| North American voltage ratings | 200 V, 230 V, 460 V, 575 V (HP ratings per NEC) |
| Breaking capacity (Icu) at 400 V | 100 kA (most ratings); 65 kA or 50 kA on highest-current codes |
| Group-motor Icu at 480 V | 65 kA (≤20 A ratings); 30 kA (25–32 A ratings) |
| HP range covered | Up to 40 HP at 575 V (F-frame 45 A) |
Thermal (Overload) Protection
| Trip class | Class 10 standard (all standard 140M-C/D/F devices) |
|---|---|
| Overload type | Adjustable thermal — field-settable across the rated range |
| FLA adjustment | Approx. 0.63× to 1.0× of the code's max Ie (e.g., B25 adjusts 1.6…2.5 A) |
| Class derating factors (MCPs used as SCPD for heavy-duty starting) | Class 10 = 1.00, Class 15 = 1.22, Class 20 = 1.42, Class 25 = 1.58, Class 30 = 1.73 |
| Overload compliance | UL 508 (overload protection), IEC/EN 60947-4-1 |
Magnetic (Short-Circuit) Protection
| Standard magnetic trip | Fixed at 13 × In (Protection Type E — adjustable thermal / fixed magnetic) |
|---|---|
| High-inrush magnetic trip | Fixed at 16 – 21 × Ie (Protection Type T — for high-starting-current motors) |
| VFD multi-motor variant (140M-D8V) | Adjustable thermal / fixed magnetic at 16…20 × In (Protection Type V) |
| Magnetic-only (MCP) trip | Fixed at 13 × In (MCP variant provides short-circuit only, no thermal) |
| Magnetic trip current range | 2.1 A (0.10-0.16 code) up to 585 A (32-45 code) |
Mechanical & Mounting
| Frame sizes | C-frame (32 A max), D-frame (32 A max), F-frame (45 A max) |
|---|---|
| Max. current Ie per frame | C: 32 A / D: 32 A / F: 45 A |
| Mounting | 35 mm DIN rail standard; optional STD BusBar top mount (code MT) |
| Operator | Rotary knob — Black Lockable (KN) or Red/Yellow Lockable (KRY); external rotary operator optional |
| Terminal style | Screw terminals; screwless spring-cage variant available (140M-RC2 series, C-frame) |
| Accessories | Auxiliary contacts (side/front), trip-indication contacts, undervoltage trips, shunt trips, Type E spacing adapters |
Catalog Number Format
How to read an Allen-Bradley 140M catalog number. Each position encodes a specific configuration attribute.
Position
Meaning
Example
140M
Bulletin number — Motor Protection Circuit Breaker (MPCB) or Motor Circuit Protector (MCP)
140M
-C / -D / -F
Frame / rating: C = 32 A, D = 32 A, F = 45 A
C = 32 A frame
2 / 8
Interrupting (breaking) capacity: 2 = Normal Break, 8 = High Break
2 = Normal Break
E / T / V / N
Protection type: E = Adj. Thermal / Fixed Mag (13×In), T = Adj. Thermal / Fixed Mag (16…20×In high-inrush), V = Adj. Thermal / Fixed Mag at VFD output (multi-motor), N = Fixed-Mag-only (MCP variant)
E = adjustable thermal, fixed magnetic at 13×In
-A63 / -B25 / -C10 / -C32 / -C45
Current range code — letter = decade (A=0.1, B=1.0, C=10, D=100, E=1000), digits = max Ie in that decade (e.g. B25 = 2.5 A, C10 = 10 A)
C10 = 10 A (adjustable 6.3–10 A)
-KN / -KRY / -TE / -MT
Miscellaneous option: KN = black lockable knob, KRY = red/yellow lockable knob, TE = Type E spacing adapter, MT = STD BusBar top mount
KN = black lockable knob
-CC / -XC / -BD …
Auxiliary trip contacts: 1st code = bottom-front module, 2nd code = right-side module (N.O./N.C. combinations, optionally SC+OL indication)
CC = 1 N.O. + 1 N.C. auxiliary (right side)
-GJ / -PA …
Left-side trip module: G = undervoltage trip, P = shunt trip; 2nd code selects coil voltage (24–600 V AC, 50/60 Hz)
GJ = undervoltage trip, 24 V AC 60 Hz
Communication Protocols
Supported industrial networks and field buses for the products covered by this publication.
None (standalone device) Bulletin 140M MPCBs and MCPs are electromechanical protection devices with no on-board network interface.
Auxiliary / trip-indication contacts Side-mounted N.O./N.C. blocks wire back to PLC digital inputs for status reporting — separate short-circuit (SC) and overload (OL) indication contact options available.
Undervoltage / shunt trip coils Left-side trip modules accept remote 24–600 V AC coil signals from PLC outputs or safety-relay contacts for remote tripping.
Certifications & Compliance
IEC/EN 60947-1
IEC/EN 60947-2 (circuit breakers)
IEC/EN 60947-4-1 (contactors and motor-starters)
IEC/EN 60947-5-1 (auxiliary contact elements)
IEC/EN 60204-1 (electrical equipment of machines)
UL 508 — Listed as Manual Type E Self-Protected Combination Motor Controller (File No. E54612)
UL 508 — Listed for Group Installation
CSA C22.2 No. 14 (cUL)
CE Marked
CCC (China Compulsory Certification) — up to 25 A for C/D frames
ATEX — IEC 60079-14 (C and D frames, up to 25 A)
Document Contents
Full PDF covers the following topics in detail:
- Complete catalog-number breakdown for the 140M- series (frame, breaking capacity, protection type, current range, knob, auxiliary contacts, and trip-coil options)
- Full product-selection tables for standard (Class 10), high-inrush, and screwless-terminal MPCB variants across C, D, and F frames
- Separate product-selection tables for Motor Circuit Protector (MCP) magnetic-only variants — 140M-C2N, 140M-D8N, 140M-F8N
- Adjustment-range, magnetic trip current, and breaking-capacity (Icu) values for every current code from 0.1 A through 45 A
- 3-phase HP ratings at 200/230/460/575 V and AC-3 kW ratings at 230/400/500/690 V for every catalog number
- Application diagrams for Group Installation (one BCPD protects multiple motors) and Multiple Motor Installation (each motor individually protected)
- Type E self-protected combination motor controller criteria — 6000 electrical / 4000 mechanical operations after a short circuit
- Type F combination-controller guidance — 140M + 100-C contactor / SMC pairing rules
- Class-20/25/30 over-dimensioning factors for MCPs used as the short-circuit protection device in heavy-duty starting applications
- Definition of Type 2 short-circuit coordination, IEC performance data, cutoff-current curves, time-current characteristics, and approximate dimensions (full tables/figures in the publication)
Frequently Asked Questions
What is the difference between a Bulletin 140M MPCB and a standard circuit breaker plus thermal overload relay?
A Motor Protection Circuit Breaker combines three functions in one device: manual disconnect, adjustable thermal overload protection (Class 10), and fixed-setting magnetic short-circuit protection (typically 13 × In). A conventional circuit breaker provides only magnetic/short-circuit protection and must be paired with a separate thermal overload relay plus disconnect. The 140M's UL Listing as a Manual Type E Self-Protected Combination Motor Controller allows a single device to satisfy NEC/CEC motor-branch-circuit protection requirements without additional upstream fuses or breakers.
Which Bulletin 140M trip class is used, and when do I need to derate the MPCB?
Standard 140M-C, -D, and -F MPCBs ship with a Class 10 overload trip characteristic, which is appropriate for most general-purpose motor starts. When a 140M-_N MCP variant is used as the short-circuit protection device for a heavy-duty starting motor (long acceleration times), the rated Ie must be over-dimensioned by the following factors: Class 10 = 1.00, Class 15 = 1.22, Class 20 = 1.42, Class 25 = 1.58, Class 30 = 1.73. This keeps the magnetic trip from responding to extended inrush current during hard starts.
What does UL 508 Manual Type E Self-Protected mean for my installation?
A Type E listing means the 140M-C…F device alone provides all branch-circuit short-circuit protection, overload protection, and disconnecting means required by the NEC/CEC for an individual motor branch. No additional upstream fuse or circuit breaker is required for motor-branch protection. To qualify, the device must pass 6000 electrical operations and 4000 mechanical operations after a short-circuit test. A Type F combination adds a downstream magnetic or solid-state controller (e.g., Bulletin 100-C contactor, SMC) to the Type E MPCB, providing the same self-protected rating for a combination starter.
Can I field-adjust the trip current on a 140M MPCB?
Yes — the thermal (overload) element is field-adjustable across the current range printed on the label (for example, a 140M-C2E-B25 adjusts from 1.6 A to 2.5 A via the front dial). The magnetic (short-circuit) trip is factory-fixed (13 × In on standard -E devices, or 16…21 × Ie on -T high-inrush variants) and cannot be user-adjusted. Always set the thermal dial to the motor's actual full-load-amp (FLA) nameplate value.
When would I use a 140M-D8V variant instead of a standard 140M-D8E?
The 140M-D8V is specifically listed for use at the output of a variable-frequency drive (VFD) in multi-motor applications — where one VFD feeds several motors, each with its own MPCB for branch protection. It uses a higher fixed magnetic trip (16…20 × In) tuned for the distorted current waveform downstream of a drive. Standard 140M-D8E devices should not be applied at a VFD output for multi-motor schemes; see Application Conditions (140M-D8V) in the publication.
What's the difference between a 140M MPCB and a 140M MCP (Motor Circuit Protector)?
An MPCB (140M-_E, -_T, -_V) provides disconnect, magnetic short-circuit, AND thermal overload protection — a complete self-protected motor controller. An MCP (140M-_N, for example 140M-C2N, 140M-D8N, 140M-F8N) provides disconnect and magnetic short-circuit protection only, with NO thermal overload. MCPs must be paired with a separate overload relay (e.g., Bulletin 193) to form a complete combination motor controller and cannot be Listed for Tap Conductor Protection in group installations because they lack the thermal element.
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