ABB DSSA165 16‑Channel Galvanic‑Isolated Relay Digital‑Output Module

Product Description

DSSA165 (3BSE007958R1) is a plug‑in distributed relay‑output I/O card developed by ABB, compatible with Freelance DCS and AC500 PLC control racks. It supplies 16‑way normally‑open Form‑A mechanical relay contacts for driving field‑side solenoid valves, indicator lamps, small‑size contactors and alarm devices. Every channel features

independent galvanic isolation, channel‑by‑channel short‑circuit protection and status‑indicator LED lights. Hot‑swap support enables card replacement without shutting down the whole control rack.

Widely deployed inside chemical plants, water‑treatment stations, thermal‑power equipment and manufacturing‑shop automation cabinets.3. Technical Specifications Full Model: DSSA165, Part‑number 3BSE007958R1 Brand: ABB, Origin: Sweden Compatible Control Platform: ABB Freelance DCS, AC500 PLC system Output Channel Quantity: 16‑channel NO Form‑A relay contacts Relay Contact Rating: 2 A @250 VAC, 2 A @30 VDC for resistive‑type loads Isolation Method: Opto‑coupler and mechanical‑relay double galvanic isolation Indicator: Individual‑channel yellow LED status lamp, system‑fault red LED Bus Interface: ABB dedicated I/O back‑plane bus Rated Working Power: 24 VDC rack‑mount power supply Power Consumption: ≤10 W Operating‑Temperature: ‑25℃ ~ +70℃ Storage‑Temperature: ‑40℃ ~ +85℃ Ambient Humidity:5%–95% non‑condensing industrial environment Protection Grade: IP20 for cabinet‑inner installation Installation: Standard DIN‑rail and rack‑plug‑in mounting Net Weight: Approx.0.40 kg Certifications: CE, UL, RoHS‑compliant, industrial EMC certification

Sixteen independent mechanical‑relay output channels for on‑site low‑power actuators. Double‑layer galvanic isolation separates field‑loop signals and internal rack‑bus circuits. Independent short‑circuit and overload safeguard on every single output channel. Visible LED lamp indication for channel running‑state and hardware‑fault diagnosis. Hot‑swap hardware design, allowing maintenance replacement without system shutdown. Good adaptability for both Freelance DCS and AC500 PLC automation platforms. Compact rack‑mount structure which saves cabinet installation space. Stable mechanical‑relay output suited for long‑time continuous‑running industrial‑site conditions.