Application Scenarios
An automated bottling line in a beverage plant used three aging pneumatic time-delay relays to sequence conveyor start-up after the main filler reached running speed. Each pneumatic unit required manual air-pressure adjustment and drifted with temperature changes, causing occasional jam-ups during morning warm-up . The maintenance electrician replaced all three with ABB 1SAR330020R0000 (CT-MFD) timers, wiring them directly to the existing 230 V AC auxiliary supply in the panel. The front-panel knob was set to ON-delay mode with staggered settings (3s, 8s, 13s) to create a soft sequential start that prevents inrush current spikes on the sensor supply . Since the retrofit, the line has logged zero timing-related jams over two production seasons. The lead electrician noted: “The 1SAR330020R0000 gave us set-and-forget reliability. No more adjusting air bleed screws, and the LEDs mean we don’t need a multimeter to know if a timer fired” .
This real-world scenario highlights a critical pain point: pneumatic and electromechanical timers drift with temperature, humidity, and age, while the ABB 1SAR330020R0000 delivers quartz-crystal precision that eliminates recalibration and reduces unplanned downtime. For plant operators managing motor control centers, HVAC systems, or pump stations, the 1SAR330020R0000 is not just a timer—it is a reliability upgrade that reduces maintenance overhead and simplifies spare parts inventory.
Parameters
| Main Parameters | Value / Description |
|---|---|
| Product Model | ABB 1SAR330020R0000 (CT-MFD Multifunction Time Relay) |
| Manufacturer | ABB (Control Products — CT Series / T Series Timers) |
| Product Category | Electronic Multifunction Time Delay Relay |
| Supply Voltage | 24–240 V AC (50/60 Hz) / 24–240 V DC — universal wide-range input, no jumper selection required |
| Power Consumption | ≤ 2.5 W (efficient operation reduces heat buildup in control cabinets) |
| Time Range | 0.1 s – 100 h, selectable via front thumbwheel and range switch (multiple ranges available) |
| Timing Functions | 8 functions: ON-delay, OFF-delay, Interval, Flashing (cyclic ON/OFF), One-Shot (Impulse), Star-Delta Changeover, Retentive ON-delay, and OFF-function for testing |
| Output Contact | 1 × SPDT (Form C): 1 NO + 1 NC, rated 16 A / 250 V AC (resistive), direct drive for small contactor coils |
| Time Accuracy | ±1% of setting + 50 ms (quartz crystal time base eliminates temperature drift) |
| Repeat Accuracy | ±0.2% of setting — consistent timing cycle after cycle |
| Indicators | Green LED = supply voltage present; Red LED = output relay energized — instant status at a glance |
| Mounting | 35 mm DIN rail (TH35, EN 50022), 22.5 mm width — snap-on mounting without tools |
| Operating Temperature | -25°C to +55°C (no condensation) — reliable in industrial environments |
| Storage Temperature | -40°C to +85°C |
| Protection Class | IP20 (terminals), IP40 (enclosure); pollution degree 2 |
| Certifications | CE, UL, CSA, CCC, IEC 61812-1 — compliant for global deployment |
| Electrical Life | ≥100,000 operations at rated resistive load |
| Mechanical Life | ≥20,000,000 operations |
| Dimensions (W×H×D) | 22.5 mm × 78 mm × 100 mm (0.89 in × 3.07 in × 3.94 in) |
| Weight | Approx. 120–150 g |
Technical Principles and Innovative Values
Innovation Point 1: Eight Timing Functions in One Device
Rather than stocking separate ON-delay, OFF-delay, flasher, and star-delta timers, the ABB 1SAR330020R0000 consolidates all eight common functions into a single SKU. The function is selected by a clearly labeled front rotary switch—no software, no DIP switches, no tools required . This makes it ideal for control panels where future logic changes are unknown at design time, and reduces spare parts inventory by up to 80% compared to maintaining separate single-function timers .
Innovation Point 2: Quartz-Crystal Time Base with ±1% Accuracy
Unlike air-dashpot or RC-network timers that drift with temperature, humidity, and component aging, the CT-MFD uses a quartz-referenced digital counter. This delivers laboratory-grade repeatability (±0.2% repeat accuracy) and immunity to temperature-induced drift across the full -25°C to +55°C operating range . For applications like star-delta motor starting, this precision ensures correct transition timing every time, preventing inrush current spikes that can trip upstream breakers.
Innovation Point 3: Universal AC/DC Wide-Range Supply
The internal switched-mode power stage accepts anything from 24 V DC battery systems to 240 V AC mains without jumpers or voltage-selection plugs . A single spare ABB 1SAR330020R0000 covers both 24 V DC control panels and 110/230 V AC MCCs—halving the number of timer spares a plant must stock. This feature is particularly valuable for global OEMs shipping equipment to regions with different voltage standards.
Innovation Point 4: Direct-Drive 16 A Contact & Dual-Color LED Diagnostics
The 16 A AgNi contact can directly switch small contactor coils, solenoid valves, or indicator beacons—eliminating intermediate interposing relays in many circuits . Front-panel green (power) and red (output active) LEDs allow technicians to confirm supply presence and timed-output state at a glance, accelerating troubleshooting during live operation without requiring a multimeter . The recovery time of <50 ms ensures the relay is ready for the next timing cycle almost immediately after reset .
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