SIEMENS 6DD1682-0BC4 — AC Natural Convection SIMADYN D SR12.4 Subrack with 12 Slots, 115/230V AC

Product Overview

The SIEMENS 6DD1682-0BC4 is a SIMADYN D system subrack (chassis) manufactured by Siemens, designed as the mechanical and electrical backbone that hosts processor modules, I/O boards and communication cards in medium- to high-power drive, motion-control and automation systems. Within the SIMADYN D product family, the 6DD1682-0BC4 corresponds to the SR12.4 subrack configuration, providing 12 Eurocard slots wired to a common L- and C-Bus backplane. Its defining thermal characteristic is AC natural convection cooling: the chassis relies entirely on passive airflow and its aluminium-rich enclosure surface to dissipate heat, eliminating the need for integrated fans. This makes the SIEMENS 6DD1682-0BC4 exceptionally well-suited to dusty, fibrous, humid or noise-sensitive industrial environments where forced-air cooling would introduce a maintenance liability. Electrically, the 6DD1682-0BC4 is powered from a standard 115/230 V AC supply, with the backplane distributing regulated auxiliary voltages to every inserted module. The subrack's L-Bus handles high-speed local data exchange between adjacent boards, while the C-Bus extends communication to remote I/O and supervisory controllers, enabling tightly synchronized multi-axis drive control, closed-loop positioning and process automation tasks. Because the SIEMENS 6DD1682-0BC4 uses natural convection rather than forced ventilation, it contains no rotating parts — a decisive advantage for plants striving to minimize unplanned downtime caused by fan bearing wear, clogged filters or acoustic emissions. In today's automation landscape, original SIMADYN D production has largely transitioned to legacy status, which means the 6DD1682-0BC4 is predominantly sourced as a mission-critical MRO spare part. Asset owners in steel, paper, printing, testing-rig and power-generation industries rely on readily available, fully tested SIEMENS 6DD1682-0BC4 subracks to keep decades-old SIMADYN D cabinets operational, avoiding the immense cost and risk of a full control-system replacement. Its robust construction, globally compatible AC input and passive-cooling philosophy make it a dependable foundation for extending the service life of installed Siemens drive systems for years to come.

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Technical Specifications

Parameter	Value
Product Model	6DD1682-0BC4
Manufacturer	Siemens AG (Germany)
Product Type	SIMADYN D Subrack / Chassis (Type SR12.4)
Cooling Method	AC Natural Convection (fanless, passive)
Operating Voltage	115 / 230 V AC, 50/60 Hz
Number of Slots	12 Eurocard slots
Bus System	L-Bus (local) and C-Bus (communication) backplane
Slot Pitch	Standard SIMADYN D Eurocard pitch
Construction Material	Industrial-grade metal chassis with natural convection fins
Mounting	Standard 19-inch cabinet / cubicle mounting
Typical Dimensions	Approx. 160–180 mm (W) × 130–150 mm (D) × 120–200 mm (H)
Typical Weight	Approx. 1.0–1.4 kg
Operating Temperature	-20 °C to +50 °C (typical industrial range)
Storage Temperature	-40 °C to +70 °C
Environmental Rating	Industrial grade; suited to IP54-class enclosed cabinets
Certifications	CE (UL listed per regional distributor documentation)
Lifecycle Status	Legacy / MRO spare part

Main Features and Advantages

The SIEMENS 6DD1682-0BC4 delivers a rare combination of mechanical robustness, thermal simplicity and system scalability that continues to make it relevant decades after its introduction. Its most distinctive advantage is fanless natural-convection cooling. By relying exclusively on passive heat dissipation, the 6DD1682-0BC4 removes the single most common failure point in industrial enclosures — the cooling fan. No bearings to wear out, no filters to clog, no acoustic noise to manage. This translates directly into lower lifecycle cost and higher availability for plants operating in dusty, fibrous, humid or otherwise hostile atmospheres.

Exceptional system expandability is native to the SIEMENS 6DD1682-0BC4. With 12 Eurocard slots wired to a shared L- and C-Bus backplane, the subrack accommodates a broad mix of SIMADYN D processor modules, signal conditioning boards, communication interfaces and I/O cards. Engineers can scale a single-axis drive controller into a multi-axis coordinated motion system simply by populating additional slots, without changing the chassis. The L-Bus ensures deterministic, high-speed data exchange between neighbouring modules, while the C-Bus enables transparent communication with supervisory PLCs, HMIs and distributed I/O stations.

Global compatibility is another strength of the 6DD1682-0BC4. Its 115/230 V AC power input with 50/60 Hz tolerance allows the subrack to be deployed anywhere in the world without step-down transformers or region-specific variants. The industrial-grade metal enclosure, finished with integral convection fins, not only promotes passive cooling but also provides electromagnetic shielding and mechanical protection for the sensitive electronics housed within.

From a maintenance perspective, the SIEMENS 6DD1682-0BC4 offers outstanding serviceability. Individual modules can be inserted or replaced independently, and because there are no moving parts to fail, preventive maintenance is essentially reduced to periodic visual inspection and contact cleaning. For asset owners managing legacy SIMADYN D installations, having a genuine, fully tested 6DD1682-0BC4 on the shelf is the most cost-effective insurance against unplanned production stops.