Description

ABB CT-MVS.21S Multifunctional Electronic Time Relay

Technical Specifications

• Product Model: CT-MVS.21S
• Brand: ABB
• Warranty: One Year
• Input Voltage: 24–240 V AC/DC universal supply
• Operating Temperature: -20°C to +60°C
• Storage Temperature: -40°C to +85°C
• Response Time: Minimum 0.05s adjustable delay
• Protection Class: IP50 housing, IP20 screw terminals
• Accuracy Class: 1% full scale timing deviation
• Output Frequency: 50/60 Hz compatible
• Rated Current Range: 4A resistive load at 250VAC per contact
• Communication Interface: No built-in data communication port
• Supported Protocols: N/A
• Overload Capacity: 120% rated contact current for 1 minute
• Dimensions: 22.5mm × 85.6mm × 103.7mm

Product Overview

The CT-MVS.21S is a DIN-rail mounted multifunctional electronic timer within ABB CT-S series, designed for flexible time-sequenced logic control in industrial electrical panels and machine automation circuits. It resolves common limitations of single-function timing relays, such as limited mode selection, narrow voltage compatibility, imprecise timing calibration and cumbersome wiring for complex sequential workflows. Equipped with 11 configurable timing modes and 10 adjustable time spans ranging from 0.05 seconds up to 300 hours, it consolidates multiple standalone timing components into a single compact module to reduce cabinet space occupation and spare part stock diversity. Machine OEM designers, control panel assemblers, on-site maintenance technicians and electrical system integrators derive practical operational benefits from its universal power input and robust mechanical structure. The unit adopts double-chamber screw cage terminals for reliable cable clamping, supports external potentiometer remote fine-tuning, and features status LED indicators for real-time working condition monitoring, fully complying with IEC 61812-1 and UL 508 standards to ensure long-term stable operation in fluctuating industrial power environments.

Core Functional Features

1. 11 integrated timing modes including on-delay, off-delay, star-delta switching, pulse generation and flashing output for diversified control logic
2. Wide 24–240 V AC/DC power supply eliminates the need for multiple coil variants for different regional control voltages
3. Two SPDT changeover contacts, with the second channel configurable as instantaneous output for dual-path signal interlock
4. External potentiometer interface allows remote timing parameter adjustment without opening the electrical enclosure
5. Ultra-narrow 22.5mm modular width with standard DIN rail snap installation for high-density cabinet layout arrangement
6. Sealable transparent cover accessory prevents accidental parameter tampering during unattended equipment operation
7. Three built-in LED indicators clearly display power status, timing progress and contact switching state for rapid on-site troubleshooting