Allen-Bradley 1336-RFB-30-A-4 Replacement RFI Filter

Product Overview

Allen-Bradley 1336-RFB-30-A-4 Replacement RFI Filter: Smooth Transition for 1336 PLUS Series Upgrades

The Allen-Bradley 1336-RFB-30-A-4 is a 30A Input RFI (Radio Frequency Interference) Filter designed specifically for the 1336 PLUS Series AC variable frequency drive platform. As Rockwell Automation progressively phases out legacy 1336 PLUS and 1336 PLUS II drive components, many industrial facilities face the challenge of sourcing compatible replacement filters to maintain EMC compliance and protect drive electronics from line-side interference. This listing provides a verified, tested replacement unit with full compatibility for existing 1336 PLUS installations — enabling a seamless retrofit without rewiring, panel redesign, or drive replacement.

Whether your facility is running a 1336 PLUS, 1336 PLUS II, or transitioning to a PowerFlex 400 or PowerFlex 700 platform, the 1336-RFB-30-A-4 serves as a critical bridge component during the migration window. Its DIN-rail or panel-mount form factor fits standard control cabinet footprints, and its 30A continuous rating covers the majority of 1336 PLUS drive frame sizes used in pump, fan, conveyor, and compressor applications.

Compatibility Comparison Table

Seamless Upgrade Solutions

Upgrading or replacing a 1336 PLUS drive system involves more than swapping the RFI filter. A complete and reliable retrofit typically requires coordinating several interdependent components within the same control cabinet or drive panel. When sourcing the 1336-RFB-30-A-4, customers frequently also require the following components to complete their migration:

The 1336 PLUS drive module itself (e.g., 1336F-BRF30-AN-EN or equivalent frame B/C units) is the primary host for this filter. In many retrofit scenarios, the drive is retained while only the filter is replaced due to EMC degradation or physical damage. Where the drive is also being replaced, customers often transition to the PowerFlex 400 (22C series) or PowerFlex 700 (20B series), both of which accept compatible RFI filter accessories from the 22-RF or 20-RF filter families.

On the power distribution side, the 1321-3R series line reactor is commonly installed upstream of the 1336 PLUS drive to supplement the RFI filter’s attenuation performance, particularly in sensitive manufacturing environments with shared transformer banks. Pairing the 1336-RFB-30-A-4 with a properly rated line reactor significantly reduces harmonic distortion and protects upstream equipment.

For I/O and control wiring, the 1336-GM series I/O option modules and 1336-BDB-SP2 dynamic braking resistor modules are often replaced simultaneously during a planned maintenance window. Technicians performing a filter swap typically inspect the drive’s 1336-MOD-series option card (such as the DeviceNet or ControlNet adapter) for firmware compatibility with the site’s existing PLC — commonly a ControlLogix L6x or L7x controller communicating over a 1756-DNB DeviceNet Bridge or 1756-CNB ControlNet Bridge module.

In cabinet-level retrofits, the 1492-series terminal blocks and 1492-CABLE series pre-wired I/O cables are frequently updated alongside the filter to meet current NEC and IEC wiring standards. Where signal isolation is required between the drive output and field instrumentation, a signal isolator or barrier module (such as those from the 931 or 937 series) is installed on the analog feedback loop to prevent ground loop interference introduced by the VFD switching frequency.

For facilities migrating from legacy SLC 500 or PLC-5 control architectures to ControlLogix or CompactLogix, the drive filter replacement is often the first step in a phased modernization plan. The 1336-RFB-30-A-4 allows the existing drive to remain operational during the controller migration, reducing total system downtime and deferring capital expenditure on a full drive replacement until the next scheduled outage.

Retrofit Guidance FAQ

Q: Can I install the 1336-RFB-30-A-4 without rewiring the existing drive panel?
A: Yes. The 1336-RFB-30-A-4 uses the same screw terminal arrangement (L1/L2/L3 input, T1/T2/T3 output) as the original OEM filter. In most installations, the existing wire lengths and conduit routing are sufficient for a direct swap. Verify terminal torque specifications per the 1336 PLUS installation manual before energizing.

Q: Is this filter compatible with both 380V and 480V AC systems?
A: The 1336-RFB-30-A-4 is rated for 480V AC, 3-phase operation. It is also compatible with 380V–460V AC systems within the 1336 PLUS drive’s input voltage tolerance range. Confirm your site voltage and transformer tap settings before installation.

Q: Will replacing the RFI filter affect the drive’s DeviceNet or ControlNet communication?
A: No. The RFI filter is a passive line-side component and has no interaction with the drive’s communication option cards (DeviceNet, ControlNet, DH+). Drive parameters, node addresses, and network configurations are unaffected by filter replacement.

Q: What is the physical footprint of the 1336-RFB-30-A-4?
A: The filter uses the standard 1336 PLUS filter mounting bracket footprint. It is designed for panel mounting within the drive enclosure or an adjacent control cabinet section. No additional mounting hardware is required for a like-for-like replacement.

Q: Can this filter be used with a PowerFlex 400 or PowerFlex 700 drive?
A: The 1336-RFB-30-A-4 is optimized for the 1336 PLUS platform. For PowerFlex 400 or 700 installations, Rockwell recommends the 22-RF or 20-RF series filters. However, in temporary or transitional retrofit scenarios, the 1336-RFB-30-A-4 may be used with an adapter bracket — consult your system integrator for site-specific validation.

Q: How do I verify the filter is functioning correctly after installation?
A: After installation, perform an insulation resistance test on the line-side terminals before energizing. Monitor the drive’s fault log for any F2 (Overcurrent) or F12 (HW Overcurrent) faults during initial run-up, which may indicate wiring issues rather than filter failure. The filter itself requires no commissioning parameters.

Warranty Assurance

Every 1336-RFB-30-A-4 unit shipped from TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to shipment, each unit undergoes a functional inspection including visual examination, terminal integrity check, and insulation resistance verification to ensure it meets the original Allen-Bradley specification.

In the event of a confirmed defect within the warranty period, TOPNLMS provides a replacement unit or full refund — whichever the customer prefers. Our after-sales response time is within 24 hours on business days. We maintain stock of common 1336 PLUS series components to support rapid replacement dispatch, minimizing your facility’s exposure to extended downtime.

All units are shipped with protective packaging appropriate for industrial electronics, including anti-static wrapping and foam cushioning. Export documentation, including commercial invoice and packing list, is provided for all international shipments. Typical lead time from order confirmation to dispatch is 1–3 business days, with DHL Express, FedEx International Priority, and sea freight options available depending on order volume and urgency.

For bulk procurement, OEM replacement programs, or MRO standing orders, please contact our sales team directly to discuss pricing, lead times, and consignment stock arrangements.