AK-R2-120P1K2 | Allen-Bradley 120-Ohm External Dynamic Brake Kit for PowerFlex 70 Drives

AK-R2-120P1K2 | Allen-Bradley 120-Ohm External Dynamic Brake Kit for PowerFlex 70 Drives

Part #: AK-R2-120P1K2 Manufactured by: Allen-Bradley

Regular price: $569.00
Sale price: $569.00
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Product Overview

Allen-Bradley AK-R2-120P1K2 PowerFlex 70 Dynamic Brake Resistor, 120 Ohm, 260 Watt, for use with 400/480V AC and 600V AC D... Read more

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Product Description P/N: AK-R2-120P1K2

Description / Specifications

Description

The Allen-Bradley AK-R2-120P1K2 external dynamic brake kit provides controlled energy dissipation for PowerFlex 70 AC drives during deceleration. With a resistance value of 120 ohms, it supports stable braking performance in applications requiring rapid motor slowdown. This kit enhances drive functionality by offering external braking capacity for systems operating across a wide voltage range.

Technical Specifications

Condition	New/Never Used Surplus
Brand	Allen-Bradley
Category	Drive Accessories
Part Number	AK-R2-120P1K2
Subcategory	External Dynamic Brake Kits
Series	PowerFlex 70
Product Type	External dynamic brake / replacement part
Resistance	120 Ohms
Continuous Power Rating	0.26 kW
Maximum Energy Rating	5 kJ
Compatible Drive Voltage	400–480 VAC and 600 VAC systems
Drive Power Compatibility	2.2 kW, 4 kW, 5.5 kW, 7.5 kW
Minimum Separation Requirement	2 inches (50.8 mm)
Heat Protection	Not included; requires system-level protection
Mounting Style	External air-cooled installation
Application Use	Dynamic braking for AC drives
Operating Consideration	Can exceed 200°C during operation

Information About AK-R2-120P1K2

The AK-R2-120P1K2 is part of the PowerFlex 70 series of external dynamic braking components designed to integrate seamlessly with Allen-Bradley AC drives. Engineered for use with motor systems rated from 2.2 kW to 7.5 kW, it provides consistent braking support for both 400–480 VAC and 600 VAC installations. The brake resistor offers a continuous power rating of 0.26 kW and is capable of absorbing up to 5 kJ of braking energy in standard configurations. Its construction supports high operating temperatures and requires physical separation from the drive for safe, air-cooled performance.

Key Features:

120-Ohm Resistance Value: Provides controlled energy dissipation for PowerFlex 70 braking operations.
Supports Multiple Drive Ratings: Compatible with drives rated from 2.2 kW to 7.5 kW across 400–480 VAC and 600 VAC systems.
0.26 kW Continuous Power: Ensures stable long-term braking capability under repeated deceleration cycles.
High Energy Handling: Rated for up to 5 kJ absorption for demanding motor applications.
External Mounting Requirement: Designed for installation outside the drive enclosure to support safe thermal operation.
Minimum Separation Distance: Requires at least 2 inches of spacing for proper air cooling and heat dissipation.
Suitable for PowerFlex 70 Drives: Integrates directly with Allen-Bradley’s mid-range AC drive platform.

The AK-R2-120P1K2 delivers the reliability and precision required for external dynamic braking in AC drive systems.

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Frequently Asked Questions about AK-R2-120P1K2

Question: What is the AK-R2-120P1K2?

Date Update:16/06/2025

Answer:

The AK-R2-120P1K2 is an external dynamic brake kit designed for use with Allen-Bradley PowerFlex 70 AC drives. It dissipates regenerative energy generated during motor deceleration, preventing overvoltage faults. This model is particularly suited for medium-power applications such as conveyors, fans, or pumps requiring frequent stops. With a resistance of 120 Ohms, it controls braking torque and heat generation efficiently. It enhances system performance by allowing fast motor stops and maintaining voltage stability.

Question: What are its dimensions?

Date Update:16/06/2025

Answer:

While the exact dimensions vary depending on mounting method, this brake kit requires a minimum 2-inch (50.8 mm) clearance from the drive for proper air-cooling. The resistor assembly is housed in a compact form factor suitable for control panels. It is designed to be installed externally near the drive system, without obstructing ventilation. Its size allows for convenient placement alongside PowerFlex 70 drives. Always consult the user manual for specific mounting dimensions.

Question: Does it have overtemperature protection?

Date Update:16/06/2025

Answer:

No, the AK-R2-120P1K2 does not include built-in heat protection. This means users must add external temperature monitoring or over-temperature cutoff mechanisms to prevent hazards. During braking, resistor temperatures can exceed 200°C, posing a fire risk if not properly managed. Allen-Bradley warns of serious safety concerns, especially if the brake IGBT in the drive fails. It is essential to follow Rockwell's guidelines for thermal safety and mechanical clearance.

Question: Can it be used in 600V systems?

Date Update:16/06/2025

Answer:

Yes, the AK-R2-120P1K2 is also rated for 600V AC input drives, making it suitable for high-voltage applications. In such systems, it can support braking for motors rated at 2.2 to 7.5 kW, same as in 400–480V applications. However, in 600V configurations, the energy absorption increases to 52 kJ, so thermal management becomes even more critical. All safety precautions must be followed strictly. Proper drive-to-resistor matching is essential for reliable braking.

Question: Is this a spare or main component?

Date Update:16/06/2025

Answer:

The AK-R2-120P1K2 is considered a replacement part or an external add-on for PowerFlex 70 drives. It is not required for basic drive operation, but is essential when braking energy needs to be dissipated efficiently. This makes it useful in retrofits or when system loads change. It's installed externally and does not affect the internal operation of the drive unless configured in the control logic. It is also useful in troubleshooting braking issues in regenerative systems.

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IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.

Description / Specifications