Siemens 8WD4428-0BF Terminal block

SIRIUS ACT is Siemens' 22 mm command and signalling platform — pushbuttons, selector switches, indicator lights, emergency-stop actuators, position switches, safety relays and signalling columns used on control panels and machines worldwide. Razz Middle East supplies the 3SU1, 3SB3, 3SE5, 3SF1, 8WD4, 3SK1, 3SE7 and 3TX7 families across Saudi Arabia, sourced to order and delivered duty-paid to your site.

Siemens 8WD4428-0BF

This page covers Siemens article number 8WD4428-0BF — Terminal block. Quote the full article number with your enquiry and the item is unambiguous: Siemens article numbers identify one exact product variant, including options that are not visible in the description.

About SIRIUS ACT Command & Signalling

SIRIUS ACT is a modular 22 mm command and signalling system. Actuators — pushbuttons, illuminated pushbuttons, selector switches, key-operated switches, emergency-stop mushroom heads, potentiometers and coordinate switches — mount into a standard panel cut-out and clip onto holders that accept stacked contact blocks and LED lamp modules. The 3SU1 generation offers plastic, metal and highly durable metal front rings, while 3SB3 remains the established predecessor still specified for spare-part continuity. Wiring is by screw, spring-loaded or ring-cable-lug terminal, and modules exist for AS-Interface and IO-Link so a complete station reaches the controller over two wires instead of a loom. The domain also covers 3SE5 and 3SE7 mechanical position and limit switches, 3SF1 safety position switches with tumbler interlocks, 3SK1 safety relays for emergency-stop and guard-door monitoring, 8WD4 signalling columns and beacons, and 3TX7 interface and coupling relays. Front-of-panel degrees of protection and wide operating-temperature ratings suit outdoor, dusty and washdown installations.

SIRIUS ACT Command & Signalling in Saudi Arabia

Command and signalling devices are the part of a control system an operator actually touches, so they appear in almost every Saudi project. Panel builders in Riyadh, Dammam and Jubail fit them into LV switchgear, MCC cubicles and pump-station panels for SWCC and NWC water and wastewater schemes. OEM machine builders in Jeddah and the industrial cities specify them on packaging, plastics and food lines. Maintenance teams serving Aramco, SABIC, Ma'aden, the Yanbu petrochemical complexes and the Riyadh Metro depots consume them steadily as replacements for worn contact blocks, faded lamp modules and damaged E-stop heads. Contractors on NEOM and the Red Sea Project value the higher IP ratings, because panels mounted outdoors in Khobar humidity or Jubail dust usually fail first at the front plate. Safety relays and interlock switches are increasingly written into HSE-driven machine-guarding upgrades.

Ordering and lead time

Quote the complete Siemens article number — a full 3SU1 or 3SE5 order code, character for character — and state the quantity. Because SIRIUS ACT is modular, confirm whether you need the actuator only, the holder, the contact or lamp blocks, or a fully assembled unit; these are separate article numbers and the most common cause of a wrong delivery. Also confirm front-ring material, contact configuration, lamp voltage and any engraved legend plates. Send the list to Razz Middle East and you will have a quotation within four working hours. Goods are sourced to order through Siemens OEM channels or through authorised Siemens distributor channels, shipped from our supplier in Italy and delivered duty-paid, typically in about three weeks. Import, clearance and the 5% customs duty are itemised separately.

Specifications are taken from the supplier's published catalogue data. Confirm against the current Siemens datasheet before ordering.