Bulletin 1492-MC Circuit Breaker
|
Bulletin 1492-MC Circuit Breakers
Industrial Circuit Breakers for North American Applications
The Bulletin 1492-MC line includes:
- 1/2 in. wide circuit breakers
- 1 in. wide circuit breakers
- Ground Fault Circuit Interrupters (GFCIs)
- Ground Fault Equipment Protector (GFEPs)
Certifications
UL Listed
CSA Certified
Features
- Designed, manufactured and listed to UL 489 (CSA C22.2, No. 5.1)
- Thermal-magnetic protection
- All Ratings (10…100 A) are HACR rated
- 10 kAIC (10…100 A)
- Finger-safe design (front) (1/2 in. wide)
- DIN Rail mounting (120/240 & 240V AC)
- Three-position handle (ON, Tripped (Middle), OFF)
- (Line and load) wire connections
Standards Compliance for Bul. 1492-MC
- UL 489
- CSA C22.2 No. 5.1
- HACR (10-100 A)
- SWD (15 and 20 A) for Switching Duty for flourescent lighting applications
Standards Compliance for GFCI
(5 mA trip sensitivity)
- UL 943
- CSA C22.2 No. 144
Standards Compliance for GFEP
(30 mA trip sensitivity)
- UL 1053
- CSA C22.2 No. 144
Bulletin 1492-MC Thermal Mag. Description
Bulletin 1492-MC Circuit Breakers for Branch Circuit protection are available in one (1)-, two (2)-, and three (3)-pole construction in 120/240 volt rating, 240 volt rating and as one (1)-pole and two (2)-pole devices in 480/277 volt rating. Versions are available as Ground Fault Circuit Interrupters and as Ground Fault Equipment Protectors.
The 1492-MC product line consists of Thermal Magnetic Circuit Breakers and Ground Fault Sensing Breakers that are designed, manufactured, and certified to North American standards, UL 489, UL 943, UL1093, and the equivalent CSA standards, CSA 22.2 No. 5.1, 22.2 No. 144.
Thermal Magnetic Circuit Breakers
Bul. 1492-MC Thermal Magnetic Circuit Breakers are general-purpose devices suitable for the majority of industrial, inverse time circuit breaker applications.
They combine thermal and magnetic trip actions and provide accurate overload and short-circuit protection for conductors and connected equipment.
Circuit Breaker Application Information
Selection of a Bul. 1492-MC circuit breaker with appropriate circuit protection includes consideration of:
- Circuit Voltage
- Circuit Frequency
- Available Short Circuit Current
- Continuous Current Rating
- Application Considerations
- Special Operating Conditions
The following discussion is based upon National Electric Code and UL requirements. Similar considerations are appropriate for Canadian applications.
Circuit Voltage
Bul. 1492-MC circuit breakers are rated by voltage class. Applications should not exceed the listed voltage range (see Table 1).
Circuit Frequency
Bul. 1492-MC circuit breakers may be applied to frequencies from DC up to 60 Hz without derating. For applications above 60…400 Hz, contact Rockwell Automation with specific application information for the derating of the circuit breakers.
Available Short Circuit Current
Bul. 1492-MC circuit breakers should only be applied in those applications in which the available short-circuit (or fault) current is less than or equal to the interrupting rating shown in the Voltage and Interrupting Ratings table.
Table 1. Voltage and Interrupting Ratings
| AC Voltage | DC Voltage ¬ | Interrupting Ratings (rms Symmetrical Amperes) | Cat. No. | |
| AC Rating | DC Rating ¬ | |||
| 120/240 | 24, 48, 62.5 | 10,000 | 3,000 | 1492-MCAA1xx |
| 1492-MCAA2xx | ||||
| 240 | 24, 48, 62.5 | 3,000 | 1492-MCAA2Hxx | |
| 1492-MCAA3xx | ||||
| 120/240 | T | T | 1492-MCBA1xx | |
| 1492-MCBA2xx | ||||
| 240 | T | T | 1492-MCBA2Hxx | |
| 1492-MCBA3xx | ||||
| 120 | T | 10,000 | T | 1492-MCEA1xx |
| 120/240 | 1492-MCEA2xx | |||
| 120 | 1492-MCGA1xx | |||
| 120/240 | 1492-MCGA2xx | |||
| ¬ Rating as supplementary protector. | ||||
| T Consult your local Rockwell Automation sales office or Allen-Bradley distributor for specific rating. | ||||
Continuous Current Rating
Bul. 1492-MC circuit breakers are rated in RMS amperes at a 40 °C (104 °F) ambient temperature per UL 489 (CSA 22.2 No. 5.1). This temperature is generally used as the average temperature within an industrial enclosure. If a circuit breaker is applied in a temperature that exceeds the 40 °C (104 °F) ambient, then the circuit breaker should be derated. Contact your local Rockwell Automation sales office or Allen-Bradley distributor for derating information.
The characteristic trip curves are shown on pages …. The trip bands shown for each breaker represent current tripping limits for a circuit breaker and are within the limits established by UL. For a specific current at 40 °C (104 °F), a circuit breaker will open ("clear the circuit") automatically at some total time that will be within the "Minimum" and "Maximum" time shown as the "Minimum" and "Maximum" curves. For example, page shows that a one pole, 15 A, 1492-MC trips in not less than 10 s and not more than 150 s on a 30 A current. Because the UL standard defines this time spread, users should not specify exact tripping time. The lower current portion of the curves (upper left) depict the time to trip due to thermal action and reflect overload protection of the wire and connect load. The higher current portion of the curves (lower right) depicts the trip due to magnetic action of the circuit breaker and reflects protection due to short circuit level currents.
Standard current ratings are, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, and 100 A.
Application Considerations
The selection of a specific ampere rating for a specific application is dependent on the type of load and duty cycle and is governed by the National Electric Code (Canadian Electric Code) and UL/CSA. In general the codes require that overcurrent protection is at the current supply and at points where wire sizes are reduced. In addition the codes state that conductors be protected according to their current carrying capacity. There are specific situations that require application consideration, such as motor circuit, and guidelines for the selection for transformer protection.
Bulletin 1492-MC circuit breakders are "non-100% rated" as defined by UL 489 Part 7.1.4.2. As such the circuit breaker's rating should be loaded to no more than 80%, if used with continuous loads.
Branch Circuits:
Bulletin 1492-MC circuit breakers may be used to protect branch circuits. A branch circuit is the wiring portion of a system extending beyond the final overcurrent device protecting the circuit.
Guidelines established in NEC, CEC, UL, and CSA should be used to determine the specific device. For example:
1) Motor Branch Circuit
Bulletin 1492-MC circuit breakers are not horsepower rated because they are able to safely interrupt currents far in excess of the locked rotor value for a selected motor. This ability is recognized in the codes and standards and is also established by the UL and CSA tests described in UL 489 and CSA C22.2 No. 5.1 standards.
The size of a Bulletin 1492-MC circuit breaker should be determined following the guidelines for an Inverse Time Circuit Breaker.
References: NEC 430.51 and UL 508A. Also see CEC and appropriate Canadian Standards.
2) Transformer Protection
Bulletin 1492-MC circuit breakers may be used for transformer protection following the guidelines established.
References: NEC 450 and UL 508A. Also see CEC and appropriate Canadian Standards.
3) Heater Load, Lighting, and Other Load Protection
Bulletin 1492-MC circuit breakers may be used for protection of heater loads, lighting loads, and other loads following the guidelines established.
References: NEC Article 31 and UL 508A. Also see CEC and appropriate Canadian Standards.
Coordinated Overcurrent Protection
Where an orderly shutdown is required to minimize the hazards to personnel and equipment, a system of coordination based upon the faulted or overloaded circuit is isolated by selective operation of only the overcurrent protective device closest to the overcurrent condition.
The user should select devices that meet this requirement.
References: NEC 240.12. Also see CEC.
Time Current Curve – 1-Pole Circuit Breaker
|
Time Current Curve – 2-Pole Circuit Breakers
|
Time Current Curve – 3-Pole Circuit Breakers
|
1492-MC Cat. No. Explanation
| 1492-MC | A | A | 1 | 15 | |
| a | b | c | d |
| a | |
| Body Style | |
| Code | Description |
| A | 1/2 in. wide/pole (DIN Rail mounting) |
| B | 1 in. wide/pole (DIN Rail mounting) |
| E | GFEP (30 mA) |
| G | GFCI (5 mA) |
| b | |
| Interrupt Rating | |
| Code | Description |
| A | 10 kA AIC |
| c | |
| Poles | |
| Code | Description |
| 1 | 1 Pole |
| 2 | 2 Poles |
| 2H | 2 Poles (240V AC) |
| 3 | 3 Poles |
| d | |||
| Current Rating | Size | ||
| Code | Description | Code | Description |
| 10 | 10 A | 50 | 50 A |
| 15 | 15 A | 55 | 55 A |
| 20 | 20 A | 60 | 60 A |
| 25 | 25 A | 70 | 70 A |
| 30 | 30 A | 80 | 80 A |
| 35 | 35 A | 90 | 90 A |
| 40 | 40 A | A0 | 100 A |
| 45 | 45 A | ||
Bul. 1492-MC Thermal Magnetic Product Selection
120/240 and 240V AC DIN Rail Mounting
| 120/240 and 240V AC DIN Rail Mounting | ||||||
| Continuous Ampere Rating @ 40°C (104°F) |
Width [in.] | Cat. No. | Width [in.] | Cat. No. | ||
| 120/240V AC | 240V AC | |||||
| 1 pole | 2 poles | 2 poles | 3 poles | |||
| 10 | 1/2 | 1492-MCAA110 | 1492-MCAA210 | — | — | — |
| 15 | 1/2 | 1492-MCAA115 | 1492-MCAA215 | 1/2 | 1492-MCAA2H15 | 1492-MCAA315 |
| 20 | 1/2 | 1492-MCAA120 | 1492-MCAA220 | 1/2 | 1492-MCAA2H20 | 1492-MCAA320 |
| 25 | 1/2 | 1492-MCAA125 | 1492-MCAA225 | 1/2 | 1492-MCAA2H25 | 1492-MCAA325 |
| 30 | 1/2 | 1492-MCAA130 | 1492-MCAA230 | 1/2 | 1492-MCAA2H30 | 1492-MCAA330 |
| 35 | 1/2 | 1492-MCAA135 | 1492-MCAA235 | 1 | 1492-MCBA2H35 | 1492-MCBA335 |
| 40 | 1/2 | 1492-MCAA140 | 1492-MCAA240 | 1 | 1492-MCBA2H40 | 1492-MCBA340 |
| 45 | 1/2 | 1492-MCAA145 | 1492-MCAA245 | 1 | 1492-MCBA2H45 | 1492-MCBA345 |
| 50 | 1/2 | 1492-MCAA150 | 1492-MCAA250 | 1 | 1492-MCBA2H50 | 1492-MCBA350 |
| 55 | 1/2 | 1492-MCAA155 | 1492-MCAA255 | 1 | 1492-MCBA2H55 | 1492-MCBA355 |
| 60 | 1/2 | 1492-MCAA160 | 1492-MCAA260 | 1 | 1492-MCBA2H60 | 1492-MCBA360 |
| 70 | 1 | 1492-MCBA170 | 1492-MCBA270 | 1 | 1492-MCBA2H70 | 1492-MCBA370 |
| 80 | 1 | 1492-MCBA180 | 1492-MCBA280 | 1 | 1492-MCBA2H80 | 1492-MCBA380 |
| 90 | 1 | 1492-MCBA190 | 1492-MCBA290 | 1 | 1492-MCBA2H90 | 1492-MCBA390 |
| 100 | 1 | 1492-MCBA1A0 | 1492-MCBA2A0 | 1 | 1492-MCBA2HA0 | 1492-MCBA3A0 |
1492-MC Ground Fault Sensing
The Bulletin 1492-MC Circuit Breakers with Ground Fault protection for Branch Circuits are available in 1- and 2-pole construction in 120/240V rating. Versions are available as Ground Fault Circuit Interrupters and as Ground Fault Equipment Protectors.
When protection from low-level fault currents for North American standards is required, two versions of protection are available.
- Circuit Breakers with protection for personnel use a threshold of 5 mA sensing to provide protection for people. These are typically know as Ground Fault Circuit Interrupters or GFCIs.
- Circuit Breakers that provide protection for equipment at a sensing threshold of 30 mA are also available. These are typically known as Ground Fault Equipment Protectors or GFEPs.
The following devices are tested and listed to meet the North American standards of UL 489, UL 943 (for GFCI), UL1053 (for GFEP), and CSA 22.2 No.5.1.
It is recommended that the devices be tested monthly by using the TEST button to check for proper operation of the device.
Bul. 1492-MC Ground Sensing Product Selection
| Cat. No. | Cat. No. | ||
| Continuous Ampere Rating @ 40 °C (104 °F) [A] | 120V AC | 120/240V AC | |
| 1 Pole | 2 Pole | ||
|
GFCI (5 mA Sensitivity) | ||
| 15 | 1492-MCGA115 | 1492-MCGA215 | |
| 20 | 1492-MCGA120 | 1492-MCGA220 | |
| 25 | 1492-MCGA125 | 1492-MCGA225 | |
| 30 | 1492-MCGA130 | 1492-MCGA230 | |
| 40 | 1492-MCGA140 | 1492-MCGA240 | |
| 50 | — | 1492-MCGA250 | |
| GFEP (30 mA Sensitivity) | |||
| 15 | 1492-MCEA115 | 1492-MCEA215 | |
| 20 | 1492-MCEA120 | 1492-MCEA220 | |
| 25 | 1492-MCEA125 | 1492-MCEA225 | |
| 30 | 1492-MCEA130 | 1492-MCEA230 | |
| 40 | 1492-MCEA140 | 1492-MCEA240 | |
| 50 | — | 1492-MCEA250 | |
| For panel mounting use two 1492-AMCP1 per device For DIN Rail mounting use one 1492-AMCDIN1 per pole |
|||
Auxiliary Devices
| Device description | 1 pole | 2 and 3 poles | |
| Locking Attachment for Circuit Breaker | 1492-MCAAxxx | 1492-AMCAL1 | 1492-AMCALM |
| 1492-MCBAxxx | 1492-AMCBL1 | ||
| Finger protection cover for 1 in. wide Cat. No. 1492‑MCBxxx, package of 10 (one required for line and one required for load for each pole) (not for GFCI / GFEP) |
1492-AMCBFP | ||
| DIN Rail adapter, per pole, DIN Rail mounting for GFCI, GFEP | 1492-AMCDIN1 | ||
| Panel Mounting Clips for GFCI and GFEP, two required per device | 1492-AMCP1 | ||
Specifications
| Standards Compliance | UL 489, CSA C22.2 No. 5.1 |
| Certifications | UL Listed, CSA Certified |
| Rated Voltage | 120/240V AC, 240V AC |
| Continuous Current rating @ 40°C (104°F) | 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 90, 100 Amp |
| Rated short circuit capability | 10 kA 120/240V AC and 240V AC 14 kA 480Y/277V AC |
| Degree of protection | Open Device 1/2 in. wide circuit breakers are finger safe from front per IEC. Terminal Covers available for 1 in. wide circuit breaker at 120/240 and 240V AC. |
| Mounting | DIN Rail (check product for specific) |
| Operating Temperature | 0…60°C (32...140°F) (non-condensing) |
| Shipment and short term storage limits | -40°C…+80°C (-40...176°F) |
| Wire Size | See Terminal Table |
| Terminal Torque | See Terminal Table |
| Recommended Wire Strip Length | See Terminal Table |
Terminals
| Cat. No. | Continuous Current Rating | Wire Type | Wire Range [AWG] | Terminal Torque | Line Strip Length | Line and Load Terminals |
| 1492-MCAAxxx | 10…60 A | Copper (Cu) | 14…10 | 20 lb•in. (2.3 N•m) |
7/16 in. |
|
| 8 | 25 lb•in. (2.8 N•m) |
|||||
| 6…4 | 27 lb•in. (3.0 N•m) |
|||||
| 1492-MCBAxxx | 35…60 A | 14…10 | 20 lb•in. (2.3 N•m) |
1/8 in. Allen Head | ||
| 8…4 | 32 lb•in. (3.6 N•m) |
|
||||
| 70…100 A | 4…1/0 | 50 lb•in. (5.6 N•m) |
||||
| 1492-MCEAxxx | 15…50 A | 14…10 | 20 lb•in (2.3 N•m) |
9/16 in. | Line | |
| 8 | 25 lb•in (2.8 N•m) |
— |
|
|||
| 1492-MCGAxxx | 6…4 | 27 lb•in (3.0 N•m) |
— | Load | ||
|
|
||||||
1492-MC Approximate Dimensions
Note: Dimensions are shown in inches (millimeters). Dimensions are not intended for manufacturing purposes.
| Catalog Type | No. of Poles | Continuous Current Rating [A] | Width [in.] |
| 1492-MCAA1xx | 1 | 10…60 | 0.490 |
| 1492-MCAA2xx | 2 | 10…60 | 0.980 |
| 1492-MCAA2Hxx | 2 | 15…30 | 0.980 |
| 1492-MCAA3xx | 3 | 15…30 | 1.470 |
| 1492-MCBA1xx | 1 | 70...100 | 1.000 |
| 1492-MCBA2xx | 2 | 70...100 | 2.000 |
| 1492-MCBA2Hxx | 2 | 35...100 | 2.000 |
| 1492-MCBA3xx | 3 | 35...100 | 3.000 |
| 1492-MCEA1xx | 1 | 15...50 | 0.990 |
| 1492-MCEA2xx | 2 | 15...50 | 1.980 |
| 1492-MCGA1xx | 1 | 15...50 | 0.990 |
| 1492-MCGA2xx | 2 | 15...50 | 1.980 |
1492-MCAAnxx
|
1492-MCEA1xx
1492-MCGA1xx
|
1492-MCEA2xx
1492-MCGA2xx
|
1492-MCBAxxx
|
