ABB 1SAR330020R0000 Migration-Ready Star-Delta Relay CT-ARS

Overview

ABB 1SAR330020R0000 Migration-Ready Star-Delta Relay CT-ARS: Legacy Control System Retrofit & Upgrade

The ABB 1SAR330020R0000 (CT-ARS series) is a star-delta time delay relay engineered for seamless integration into both active and aging industrial control architectures. As legacy motor starter panels reach end-of-service life and OEM support for discontinued timing relays is withdrawn, the CT-ARS provides a verified drop-in replacement path that preserves existing wiring layouts, terminal assignments, and control logic without requiring panel redesign or PLC reprogramming. For maintenance engineers managing retrofit projects under tight downtime windows, this module delivers the electrical and mechanical compatibility needed to restore full motor protection functionality with minimal intervention.

The 1SAR330020R0000 operates on a wide supply voltage range and provides adjustable star-to-delta transition timing, making it suitable for retrofitting across a broad spectrum of legacy motor control centers (MCCs), soft-starter bypass panels, and direct-on-line (DOL) starter cabinets. Its DIN rail mounting footprint is consistent with the ABB CT series family, allowing direct substitution in existing enclosures without modification to cable trays, mounting rails, or adjacent components such as the ABB CT-MVS motor protection relay or CT-TGD star-delta timing relay that may occupy the same control cabinet.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful integration of the ABB 1SAR330020R0000 into a legacy motor control system begins with a structured pre-retrofit audit. Before removing the failed or end-of-life timing relay, document the existing wiring diagram, terminal block assignments, and the current timing setpoint. In many legacy panels, the CT-ARS is wired in conjunction with an ABB A-series contactor (such as the A26 or A30) for the star contactor and a separate main contactor for the delta transition. Confirm that the coil voltage of these contactors matches the output contact rating of the replacement relay before energizing.

In control cabinets where the original relay was mounted alongside an ABB S200 series miniature circuit breaker (MCB) for relay circuit protection, verify that the MCB trip curve and current rating remain appropriate for the new module’s inrush characteristics. Similarly, if the panel includes an ABB CM-MPS.41 phase and voltage monitoring relay for motor protection, ensure that the star-delta transition timing set on the 1SAR330020R0000 does not conflict with the monitoring relay’s restart inhibit timer — a common source of nuisance tripping during post-retrofit commissioning.

For systems where the original timing relay interfaced with an ABB CP600 or CP400 series HMI panel via discrete I/O signals, no communication protocol migration is required, as the CT-ARS operates on hardwired logic. However, HMI screen elements that display star/delta transition status via digital input feedback should be verified against the new relay’s output contact numbering to ensure correct signal mapping. If the control system includes an ABB AC500 PLC managing the motor starter sequence, review the PLC program’s timer block to confirm whether the hardware relay timer is redundant or serves as a backup interlock — in some legacy designs, both timers must be coordinated to prevent simultaneous star and delta contactor energization.

Where the retrofit involves replacing multiple timing relays across a production line, consider staging the work by motor group to maintain partial production continuity. Spare terminal ferrules, DIN rail end stops, and relay socket adapters (if applicable) should be staged in advance. All replacement modules should be bench-tested for timing accuracy before installation to eliminate field adjustment time and reduce total commissioning duration.

Downtime Control During System Migration

Minimizing unplanned downtime during a star-delta relay replacement requires preparation that begins before the maintenance window opens. The most effective approach is to pre-configure the replacement ABB 1SAR330020R0000 to the documented timing setpoint of the outgoing relay, so that the on-site swap is limited to terminal disconnection, module removal, module insertion, terminal reconnection, and a single functional test — typically achievable within 15–30 minutes per motor starter position.

To protect the original PLC program logic during the retrofit, do not modify any PLC timer parameters or I/O address assignments during the hardware swap. The CT-ARS operates as a standalone hardwired timer; its replacement does not require any PLC program download, firmware update, or fieldbus reconfiguration. This isolation from the software layer is a key advantage when working in environments where PLC program change control procedures impose additional approval delays.

For critical production lines where even a brief interruption is unacceptable, a parallel commissioning approach can be used: install the replacement relay on a temporary DIN rail section adjacent to the existing module, wire it in parallel with the original, and verify timing output before transferring the load. Once confirmed, the original relay can be removed and the temporary wiring cleaned up during the next scheduled maintenance interval. This approach maintains control continuity and eliminates the risk of an incorrect timing setpoint causing a failed motor start during peak production hours.

After the swap, perform a supervised motor start sequence — star phase, timed transition, delta phase — and confirm that the transition occurs cleanly without contactor chatter, voltage dip alarms, or motor protection relay trips. Log the as-found and as-left timing values for the maintenance record. All units supplied by KNMKS are pre-shipment tested and covered by a support terms confirmed by quotation from the date of delivery.

Retrofit Support FAQ

Q1: Is the ABB 1SAR330020R0000 a direct replacement for the CT-ARS and CT-TGD series relays?
The 1SAR330020R0000 is the current ABB catalog reference for the CT-ARS star-delta time delay relay. It is dimensionally and electrically compatible with earlier CT-ARS variants and can substitute for the CT-TGD in star-delta applications where the timing function and contact configuration match. Always cross-reference the terminal diagram of the outgoing relay against the 1SAR330020R0000 datasheet before installation.

Q2: What wiring checks are required before replacing the relay?
Confirm supply voltage at terminals A1/A2, verify output contact wiring to the star and delta contactor coils, and check that the existing wire gauge is within the terminal’s rated range (typically 0.5–4 mm²). Record the existing timing setpoint before removal. If the panel uses a relay socket, confirm socket compatibility with the CT-ARS footprint.

Q3: How is the replacement relay commissioned on-site?
Set the timing dial to the documented star-to-delta transition time (typically 5–15 seconds for standard induction motors). Apply control supply voltage and initiate a test start sequence with the motor uncoupled from the load if possible. Observe the output contact transition using a multimeter or the panel’s existing indicator lamps. Adjust timing if required and repeat the test under loaded conditions before returning the system to service.

Q4: What are the stock availability and support terms terms?
KNMKS maintains in-stock inventory of the ABB 1SAR330020R0000 for immediate dispatch. All units are sourced from authorized supply channels, pre-shipment tested, and covered by a support terms confirmed by quotation from the date of shipment. For volume orders or urgent retrofit requirements, contact our sales team directly for lead time confirmation and expedited shipping options.

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