ABB 1SAR330020R0000 Multifunction Electronic Time Relay | 24–240V AC/DC

Application ScenariosAt a municipal water treatment plant in Northern Europe, operators struggled with chronic mistiming in their sequential pump-start routine. The legacy pneumatic timers — installed over two decades ago — had drifted badly with seasonal humidity changes, causing pumps to stage incorrectly and triggering repeated overload trips on the 315 kW main drives. After redesigning the motor control center (MCC) around the ABB 1SAR330020R0000, each pump feeder now receives a precisely timed start command: the 1SAR330020R0000​ holds the next starter in off-delay for exactly the programmed interval before energizing, ensuring a soft, sequential ramp-up that slashed inrush current spikes by 60%. The maintenance lead remarked that the dual-color LED (green = supply, red = output) made commissioning “almost foolproof — no more multimeter gymnastics.” Across 48 pumping and blower feeders, the 1SAR330020R0000​ units have run maintenance-free for over four years, eliminating the nuisance trips that previously cost the utility an estimated €180,000 annually in unplanned downtime and emergency service calls.Parameter

Technical Principles and Innovative Values

• Innovation Point 1: Quartz-Precision Time Base.​ The ABB 1SAR330020R0000​ abandons the air-dashpot principle of legacy timers in favor of a quartz crystal oscillator circuit. This delivers ±1% accuracy versus ±10–20% for pneumatic designs, and — critically — the timing is completely immune to ambient temperature and humidity fluctuations. A plant that replaces ten old pneumatic timers with 1SAR330020R0000​ units can expect timing drift to virtually disappear, regardless of seasonal weather.
• Innovation Point 2: Eight Functions in One Device.​ Through a front-panel rotary selector, the 1SAR330020R0000​ covers on-delay, off-delay, interval, cycle, star-delta transition, pulse output, and more. For panel builders and maintenance teams, this means a single stock-keeping unit replaces an entire shelf of single-function relays. During commissioning, if the control logic demands a different timing behavior, the 1SAR330020R0000​ is reconfigured in seconds with a screwdriver — no rewiring, no parts swap.
• Innovation Point 3: Universal AC/DC Auto-Sensing Supply.​ The 1SAR330020R0000​ accepts 24–240 V AC or DC on the same terminals, automatically recognizing the supply type. This eliminates the most common procurement headache in multinational projects: a single spare part services 24 V DC control circuits in North America, 110 V AC panels in Japan, and 230 V AC cabinets in Europe. Stocking complexity drops; availability rises.
• Innovation Point 4: High-Current Direct Switching.​ With up to 16 A contact capacity at 250 V AC (model dependent), the ABB 1SAR330020R0000​ can directly drive AC contactor coils and solenoid valves without an intermediate relay. This reduces panel component count, shrinks wiring, and removes failure points. The dual-break SPDT contact structure ensures clean switching even for moderately inductive loads.
• Innovation Point 5: Noise Immunity for Harsh Electrical Environments.​ Conformal-coated PCBs and a metal-reinforced housing give the 1SAR330020R0000​ strong resistance to electromagnetic interference — verified to IEC 61000 EMC standards. It operates reliably adjacent to variable-frequency drives, soft starters, and contactor banks where lesser electronic timers would false-trigger.

Application Cases and Industry ValueBeyond the water treatment case above, the ABB 1SAR330020R0000​ has delivered significant value across multiple industries. In a commercial HVAC central plant serving a Middle Eastern airport, the building management system (BMS) relied on sequencer logic to stage six 500-ton centrifugal chillers. The original electromechanical timers exhibited random drift, causing two chillers to start simultaneously on several occasions — each event drew a 900 A inrush that tripped the building’s main 1600 A service breaker, darkening the entire terminal for up to 20 minutes. After retrofitting the chiller control panels with ABB 1SAR330020R0000​ relays, the staging sequence became perfectly deterministic. Over an 18-month observation period, the facility recorded zero simultaneous-start events and reduced unplanned BMS downtime by 94%. The facilities director noted: “The 1SAR330020R0000​ paid for itself in the first week — we haven’t had a single blackout since.”In a Southeast Asian food-processing plant, the 1SAR330020R0000​ was deployed as the heart of a bottle-rinsing conveyor’s interval-control loop. The conveyor needed to pause each bottle precisely 2.5 seconds under the rinse head — too short, and sanitation failed; too long, and throughput collapsed. The plant’s engineering team used the interval timer mode of the 1SAR330020R0000​ to lock in the 2.5-second window with ±1% precision. Production data showed a 15% increase in effective throughput and a 100% pass rate on hygiene audits, directly attributable to the timer’s repeatability. The maintenance team further appreciated that the 1SAR330020R0000‘s DIN-rail design allowed a failed unit to be swapped in under 90 seconds during a line changeover, versus the 15-minute panel teardown required by the previous timer.