Three supplier tiers now cover roughly 90% of industrial time relay demand: European brand OEMs (Schneider Electric, Finder, Elko EP, Selec) selling 17.5 mm DIN-rail multifunction units at AC/DC 12-240V universal supply; Chinese volume manufacturers (Rocfly, Geya, VIOX, FBelec, Alion) producing panel-mount and 35 mm rail formats with 1-5A / 250VAC contact ratings; and automotive-grade specialists (MRS Electronic) supplying IP53 to IP6K8 sealed units for 9-32V DC vehicle and machinery cabinets [S1][S2][S3][S5][S8].
Common spec anchors across catalogues: 0.1 s to 100 h or 30 days timing range, 1 or 2 changeover (SPDT/DPDT) AgNi or silver-alloy contacts, 8 A or 16 A output rating, and front-knob or LCD scaling on a 17.5 mm or 18 mm DIN-rail housing, with the dominant mounting standard still the 35 mm DIN rail per IEC 60715 [S1][S5][S6].
Universal-Voltage DIN-Rail Multifunction Units (Panel-Builder Mainstream)
Universal AC/DC 12-240V supply is now the default SKU for European-brand multifunction timers, replacing legacy 230V-only and 24V-only models that used to dominate panel-builder shelves [S1][S5].
Elko EP's CRM-111H/UNI runs 11 functions across 50 ms to 30 days with a single 16 A changeover; the CRM-91H/UNI delivers 10 functions in a 0.1 s to 10 days band for the same 16 A contact class; and the 11-pin octal PTRA-216K/UNI pushes to 2x16 A changeover for star-delta and pump-changeover panels [S5]. The Selec 600DT extends function count to 15 modes with 8 time ranges and an LCD readout on a 17.5 mm rail footprint, while the Selec 600XU keeps the same 17.5 mm width for analogue-knob panels at 13 functions and 10 ranges [S1].
Finder Series 80 modular timers and Schneider RE17R-series units share the same 17.5 mm housing, 24-240 VAC/DC universal supply positioning, and IEC-linked accuracy statements, so panel builders can second-source across two European catalogues without redesigning the DIN-rail cut-out [S4]. The Geya GRT8-K1 covers 0.1 s to 99 h on a 12-240V AC/DC supply with a 5 A contact, aimed at commercial and light-industrial cabinets [S9]. For a primer on how these compare to other timing elements, see the time relay reference page.
Single-Function, Star-Delta, and Off-Delay Specialists
Single-function on-delay and true off-delay units remain specified where the application logic is locked, because the lack of mode switching reduces wiring errors and trimmer confusion in OEM machine builds [S5].
Elko EP's CRM-181J/UNI sells as a 1-function on-delay with 0.1 s to 100 h range and a 16 A changeover, with the CRM-182J and CRM-183J adding a second and third contact in the same housing [S5]. The CRM-82TO/UNI delivers a true off-delay without supply voltage (S-break function) on 2x8 A changeover, and the CRM-2T/UNI is purpose-built for star-delta motor starters with t1 at 0.1 s to 100 days and t2 fixed at 0.1 to 1 s across 2x16 A [S5].
Elko's CRM-2H/UNI asymmetric flasher covers 0.1 s to 100 days on a 16 A changeover for beacon, duty-cycle, and intermittent-load applications. Schneider's RE17R* family matches this with on-delay, off-delay, and interval functions in a 17.5 mm package, while Finder Series 80 fills the 11-pin octal socket niche that older panel designs still call out [S4][S5].
Automotive- and Machinery-Grade Sealed Time Relays
MRS Electronic's M1 compact and M3 lines sit in a different spec class, with 5-pin housings, 9-16V or 14-32V DC operating windows, 15-20 A switching current, and IP53 or up to IP6K8 sealing for engine compartments and mobile machinery [S2].
The M1 compact on-delay at 12V draws 1 mA quiescent current, switches 20 A, and is rated for 100,000 switching cycles with IP53 sealing; the M3 on-delay at 12V lifts the seal to IP6K8 for direct road-spray exposure and drops NC rating to 15 A while keeping NO at 20 A [S2]. MRS also offers an "adjust" variant (1.022.11y.xx / 1.022.11z.xx) with manually settable on- or off-delay, useful for field-tunable vehicle harnesses where the timer is buried behind a panel [S2].
These units diverge from DIN-rail panel timers on three gates: voltage class (DC only, sub-32V), sealing (IP53 to IP6K8 vs the typical IP20 of a DIN module), and pin count (5-pin automotive blade, not 11-pin octal or screw terminal). For broader context on how timing blocks fit with other control elements, the industrial relay and protection relay reference pages map the adjacent categories.
Chinese Volume Manufacturers: Rocfly, FBelec, Geya, VIOX, Alion
Chinese suppliers concentrate on panel-mount and 35 mm rail SKUs with 5 A / 250VAC silver-alloy contacts, AC24V/110V/220V/380V 50 Hz multi-voltage windings, and DC24V coils for OEM machine and HVAC export [S3][S7][S8][S10].
Rocfly's ZN48 specifies AC220V/110V/24V/380V 50 Hz or DC24V supply, 5 A contact at AC220V or DC24V resistive, mechanical life of 3 x 10^6 cycles and electrical life of 1 x 10^6 cycles, and a 0 to +40°C ambient window in either panel-mount or 35 mm rail format [S3]. The AH3-3 emphasises wide delay range and anti-interference; the LT48S-2ZH adds dial-code digital display and multiple working modes; and the KG316T runs 1 minute to 168 hours with 16 on/off programs and a timing error below 0.5 s/day at AC220V 50 Hz within 85% to 110% Ue [S3].
VIOX's FCT18 line bundles on-delay, off-delay, pulse, interval, bistable, flashing, and multifunction modes in a compact DIN-rail format for machine sequencing, motor auxiliary logic, and ventilation timing [S8]. FBelec markets Fuji- and Taiwan-derived industrial control relays, with 25 years and 16 production lines claimed by Alion, whose factory certifications include ISO 9001, CE, UL, TUV, VDE, and RoHS [S7][S10]. Sofielec's ZHRT2-A1 covers 0.1 s to 100 h on 24V DC / 110V AC / 230V AC, with 1CO or 2CO contact options and 35 mm DIN-rail mounting for industrial control panels [S6].
Selection Gates: Function Count, Time Range, Contact Rating, Mounting
Four gates separate the catalogue into buyable SKUs: function count (1-function single-purpose vs 10-15-function multifunction), time range band (0.1 s to 100 h typical, up to 30 days on premium models, up to 100 days on flashers), contact rating (5 A for Chinese volume, 8 A or 16 A for European brand), and mounting/width (17.5 mm or 18 mm DIN rail, 11-pin octal, 5-pin automotive blade, or panel-mount) [S1][S2][S3][S5][S6].
Supply voltage is the fifth gate: AC/DC 12-240V universal for European brand multifunction; AC220V 50 Hz or multi-tap 24/110/220/380V for Chinese panel-mount; DC 9-32V for automotive/machinery sealed; and 24V DC for cabinet builders standardising on a single DC bus [S1][S2][S3][S5]. A typical decision rule: 11-function 50 ms to 30 days 16 A changeover (CRM-111H/UNI) for general-purpose panels; 2x16 A star-delta (CRM-2T/UNI) for motor starters; 1-function on-delay 16 A (CRM-181J/UNI) for OEM machines; 0.1 s to 100 h 5 A ZHRT2-A1 for HVAC and lighting; and 5-pin IP6K8 M3 on-delay for mobile machinery and engine-bay harnesses [S2][S5][S6].
For lighting and ventilation control cabinets that run timers alongside contactors and MCBs, the lighting equipment and electric lamps and lamps and light fittings reference pages cover the downstream load-side selection. Construction-machinery timers for crane sequencing and hoist interlock sit on the construction machinery and equipment spec map.
Verification and Failure Modes to Track
Verification anchors: 3 x 10^6 mechanical cycles and 1 x 10^6 electrical cycles on Rocfly ZN48; 100,000 switching cycles on MRS M1/M3 automotive units; timing error under 0.5 s/day on Rocfly KG316T at 85% to 110% Ue; and 0 to +40°C ambient on Chinese volume panel-mount SKUs versus wider industrial ranges on Elko UNI and Schneider RE17 [S2][S3][S5]. Spec sheets should be cross-checked for IEC 60715 DIN-rail compliance, IEC/EN 61810-1 electromechanical relay generic safety, and any application-specific ATEX or IECEx marking for hazardous-area cabinets.
Two trackable signals to monitor: Chinese suppliers adding UL 508 listing alongside CE for North American cabinet builders, and the spread of 5G/IoT-connected timers with remote setpoint over LoRaWAN or Modbus TCP for water and HVAC telemetry. Related sourcing context for adjacent control-cabinet categories is in the industrial lubricant selection for oil and gas spec map and the orifice plate flowmeter suppliers guide, which cover the same panel-builder and EPC procurement workflow.