The HMISTO531S is a Schneider Electric Harmony STO touch panel screen — a compact HMI with a 3.4 inch backlit monochrome STN LCD, 200 x 80 pixel resolution, and 16-level touch contrast. It runs on a 333 MHz RISC CPU with 16 MB application memory and 128 kB backup, consuming 5 W from a 24 V DC supply (+/- 20 %). The front panel is rated IP65 and NEMA 4X (indoor use), making it suitable for washdown or dusty environments on a food, packaging, or light assembly line. The rear enclosure is IP20 for panel interior protection.
Schneider HMISTO531S Harmony STO Touch Panel, 3.4" Monochrom
MPNHMISTO531S
Obsolete
Schneider Electric Harmony STO & STU series, touch panel screen HMISTO531S, 3.4 inch backlit monochrome STN LCD, 200 x 80 pixels, 24 V DC, IP65 front panel, CE, UL 508.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Display type | Backlit monochrome STN LCD |
Product details
Frequently asked questions
What is the supply voltage requirement for HMISTO531S?
It requires an external 24 V DC supply (+/- 20 %), drawing 5 W typical with a 30 A inrush peak.
What compliance documentation does HMISTO531S carry?
It carries CE marking and complies with UL 508, EN 61131-2, UL 1604, IEC 61000-6-2, and FCC Class A.
MPN
HMISTO531S