Schneider Electric ZALVB4 Red 24 V LED Light Block

ZALVB4: red 24 V LED light block for XB5 heads

The ZALVB4 is a Schneider Electric Harmony XAL light block: a small rear-mounted module with a red integral LED and a rated supply of 24 V AC/DC, built to sit behind a 22 mm illuminated head of the XB5 type. Seven Star LLC supplies the ZALVB4 in Oman and the GCC as an independent supplier in Muscat, mainly for maintenance teams that need to restore illuminated heads on existing control stations.

The datasheet marks this reference as discontinued on 15 Jun 2023, and the datasheet used here is dated 8 Nov 2026. Stock of discontinued parts can therefore vary, and we state the datasheet date plainly so that you can judge it. The reading of the code ZALV as the light block family, with the colour digit following, is our interpretation of the catalogue title, not a published ordering table.

Supply and LED characteristics of the ZALVB4

The block is designed for a 24 V AC/DC supply with limits of 19.2 to 30 V DC and 21.6 to 26.4 V AC, so the same module works on a 24 V DC control bus and on a 24 V AC control transformer. It is a direct supply design with steady signalling, and the datasheet quotes a service life of 100000 hours at rated voltage and 25 °C. The datasheet lists the light source as an integrated and protected LED and the current draw as 18 mA. It adds that all coloured LED blocks are replaced by a single universal LED block for use with new illuminated heads, which is the main point to check when buying for a new project.

At 18 mA per module, a row of ten lamps draws a load that is easy to cover from a small 24 V supply, but the total should still be added when many blocks share one fuse. Because the lamp is an LED, it will not burn out in the way a filament bulb does, though its brightness falls over time and with high temperature.

The meaning of a red indicator

Red is normally reserved for faults, trips and danger, or for a stopped state where the plant specification says so, so it should not be given to a harmless indication. A light block only provides the light source; the visible colour of the finished indicator also depends on the lens of the head it sits behind, so confirm the lens colour when matching a station.

The datasheet describes the colour of the light source as red. When one lamp of a row is replaced, compare the brightness and shade with its neighbours, since a new LED can look different next to an old one of the same nominal colour.

Mounting and wiring of the ZALVB4

The block mounts at the rear of an XB5 head and is assembled by the customer. Connection is by two screw clamp terminals marked X1 and X2 on the product, accepting up to two conductors of 1.5 mm² with cable ends or conductors from 0.22 mm² without ends, tightened to 0.8 to 1.2 N.m. The screws take Philips or pozidriv No 1 drivers and flat 4 mm or 5.5 mm blades.

The unit weighs 0.015 kg and is sold in an indivisible quantity of 5, so a single order of ZALVB4 normally arrives as a pack of five. The package data in the datasheet gives a single carton of about 1 × 3.5 × 4.5 cm for one unit and a box of five. The IP20 rating is for the finger-safe module and does not describe the sealing of the finished head.

Where the ZALVB4 is used in the region

Light blocks like the ZALVB4 are found in motor control centres, pump and compressor stations, switchgear doors, and packaged equipment in oil and gas, power, desalination and water sites in Oman and the GCC. In these plants the lamp shows running, ready, trip or supply status, and a dead lamp can mislead an operator, so replacing a failed block quickly is routine maintenance.

Because the reference is discontinued, plan ahead: for a large fleet of stations, ask us about the current replacement option for your heads, and keep spare blocks of the older type for stations that cannot be changed.

Technical specifications of the ZALVB4

Selection checklist and RFQ information for ZALVB4

Send the details below so that we can confirm the part number against the datasheet and check the stock position of this discontinued reference.

• Part number ZALVB4 and the quantity, remembering the pack of 5.
• The supply voltage, confirmed as 24 V AC or DC.
• The head type and lens colour the block will sit behind, checked against the XB5 destination.
• A photo of the existing block or the head, to confirm the match.
• Whether a current replacement block would be acceptable if this one is unavailable.
• Delivery location in Oman or the GCC and the lead time needed.

Environmental and EMC data of the ZALVB4

The block is rated for -40 to 70 °C in operation and storage, vibration of 5 gn from 12 to 500 Hz and shock of 30 gn for 18 ms and 50 gn for 11 ms. It lists resistance to fast transients of 2 kV, to electromagnetic fields of 10 V/m and to electrostatic discharge of 6 kV on contact and 8 kV in air, with class B emission, which means the lamp is intended to be placed in a control cabinet beside relays and contactors without special filtering.

The datasheet lists UL listed and CSA certifications and standards IEC 60947-5-1, 60947-5-4 and 60947-5-5 among others. Any other approval, such as marine or hazardous area, should be accepted only if the datasheet for this reference lists it, and this one does not.

Documents and quotation

The Schneider Electric datasheet for the ZALVB4 is attached on this page for your technical file. It holds the electrical, mechanical and environmental data summarised above, with the drawings and packaging data.

To request a quotation, send the part number and quantity through the enquiry form and we will reply with availability and delivery terms. Seven Star LLC is an independent supplier and does not act for the manufacturer, so please check the datasheet against your project requirements before ordering.