ABB HIEE300744R0001 Replacement for SACE UAC318 AE

Product Overview

ABB HIEE300744R0001 Replacement for SACE UAC318 AE: Seamless Transition & Legacy System Compatibility

The ABB HIEE300744R0001 is a critical low-voltage circuit breaker component within the ABB SACE UAC318 AE series, widely deployed in industrial power distribution panels, motor control centers (MCCs), and process automation switchgear across manufacturing, energy, and infrastructure sectors. As legacy ABB SACE switchgear platforms age and original components approach end-of-life, plant engineers and procurement teams face increasing pressure to source verified replacement units that maintain full electrical and mechanical compatibility without requiring panel redesign or rewiring.

TOPNLMS specializes in sourcing, testing, and supplying hard-to-find ABB SACE components including the HIEE300744R0001, providing a reliable upgrade path for facilities operating aging low-voltage distribution systems. Every unit is inspected prior to dispatch and backed by a 12-month warranty.

Compatibility Comparison Table

Seamless Upgrade Solutions

Replacing the HIEE300744R0001 in an aging ABB SACE switchgear installation rarely occurs in isolation. A successful retrofit typically involves evaluating the surrounding system architecture to ensure every interconnected component supports the upgraded circuit breaker’s performance envelope. During the migration process, engineers commonly address the ABB PR222DS or PR223DS electronic trip unit, which governs the protection functions of the SACE UAC318 AE frame and must be verified for firmware compatibility with the replacement breaker. Where communication-based monitoring is in use, the ABB COM15 or COM800 communication module — connecting the breaker to a Modbus RTU or Profibus DP network — should be inspected and, if necessary, replaced alongside the HIEE300744R0001 to maintain uninterrupted SCADA or DCS integration.

In motor control center applications, the SACE UAC318 AE often operates in conjunction with ABB AF-series contactors and A-series soft starters. When upgrading the circuit breaker, it is advisable to audit the associated ABB AF96 or AF116 contactor for contact wear and confirm that the motor protection relay — such as the ABB EF750 or EF146 — remains correctly coordinated with the new breaker’s trip curve settings. This coordination check is essential to avoid nuisance tripping or under-protection during the commissioning phase following replacement.

For installations where the SACE UAC318 AE is mounted in a withdrawable cradle, the ABB EF-series withdrawable chassis and associated secondary disconnects should be inspected for mechanical wear. The auxiliary contact block — a common companion component in SACE switchgear — provides position signaling to the PLC or DCS and must be confirmed operational after the breaker swap. In many legacy panels, the ABB SK1 or SK2 auxiliary contact kit is the correct accessory to restore full signaling functionality without modifying the existing wiring harness.

Where the control system relies on an ABB AC500 PLC or a third-party Siemens S7-300/S7-400 controller for breaker status monitoring, the digital input module receiving the auxiliary contact signal should be tested for correct logic-level compatibility. In DCS environments — particularly those running ABB System 800xA or ABB Freelance — the field device integration layer may require a configuration update to reflect the new breaker’s diagnostic data points after the HIEE300744R0001 is commissioned. TOPNLMS can supply the HIEE300744R0001 together with companion SACE accessories to support a complete, single-source procurement for your retrofit project.

Retrofit Guidance FAQ

Q: Can the HIEE300744R0001 be installed without rewiring the existing panel?
A: Yes. The HIEE300744R0001 is designed as a direct replacement for the SACE UAC318 AE series and maintains the same terminal layout as the original unit. In most installations, no rewiring is required. Engineers should verify cable lug sizing and torque specifications against the replacement unit’s datasheet prior to installation.

Q: Is the HIEE300744R0001 compatible with existing ABB PR2xx and PR3xx electronic trip units?
A: The SACE UAC318 AE frame is compatible with ABB’s PR2xx and PR3xx trip unit families. When replacing the HIEE300744R0001, the existing trip unit can typically be retained, provided it is within its service life and its protection settings are re-verified and re-commissioned after the breaker replacement.

Q: Will the replacement breaker fit in the existing panel cutout and withdrawable cradle?
A: The HIEE300744R0001 conforms to the standard SACE UAC318 AE frame dimensions. It is compatible with existing fixed and withdrawable mounting arrangements. Physical clearances should be confirmed against the panel’s original engineering drawings before installation.

Q: How do I update the communication configuration after replacing the breaker?
A: If the breaker is connected to a Modbus RTU or Profibus DP network via an ABB COM15 or COM800 module, the communication parameters (device address, baud rate, parity) should be re-entered after installation. No changes to the network wiring or PLC/DCS program are typically required if the replacement unit is of the same type.

Q: What is the lead time and how is the unit tested before shipment?
A: TOPNLMS maintains stock of the HIEE300744R0001 for prompt dispatch. Each unit undergoes pre-shipment functional inspection. Standard international shipping from Xiamen, China is available with tracking. Express options are available to minimize plant downtime.

Warranty Assurance

Every ABB HIEE300744R0001 supplied by TOPNLMS is covered by a 12-month warranty from the date of shipment. Our pre-shipment inspection process includes visual examination, functional verification where applicable, and packaging integrity checks to ensure the unit arrives in full working condition.

In the event of a warranty claim, TOPNLMS provides responsive after-sales support including replacement dispatch and technical assistance. We understand that unplanned downtime in industrial environments carries significant operational cost, and our procurement guarantee is designed to give maintenance engineers and plant managers confidence in every order.

For bulk procurement, project-based sourcing, or urgent replacement requirements, please contact our technical sales team directly. We support single-unit orders through to multi-unit project supply for MRO, capital projects, and planned maintenance shutdowns.