Where this drive sits on the BOM
The Delta VFD015B21A is a B-series variable frequency drive in the 230V single-phase class, rated at 1.5 kW (2 HP) — a fractional frame typically specified for small pumps, fans, blowers, and conveyor sections where single-phase utility is the only available supply. The model code decodes cleanly: '21' marks the single-phase 230V input, 'A' denotes the version/type, 'B' is the B-series platform, and '015' is the 1.5 kW frame. The unit falls inside Delta's 1–2 HP (0.75–1.5 kW) power band, which is the common slot for retrofitting fixed-speed single-phase motors onto a variable-speed bus.
What the operational ratings drive
Overload endurance is 150% of rated current for one minute, which sets the headroom for breakaway torque on conveyors or compressor start transients before the drive trips into current limit. Stall prevention is configurable from 20% to 250% of rated current — a wide enough window to clamp to the driven load rather than the drive's own ceiling. Frequency setpoint resolution is 0.01 Hz, and three skip-frequency zones are programmable across 0.1–400 Hz — useful for steering past mechanical resonances in fans, pumps, and belt-driven machinery. Ambient operating humidity is rated below 90% RH non-condensing; storage and transport temperature spans −20 °C to 60 °C, which is the handling envelope to respect when staging drives on a panel-build floor or shipping them to a remote site. Fan cooling is built in, so the enclosure layout needs to preserve the drive's airflow clearance.
Procurement posture and project fit
Ordering is handled through independent distribution against an RFQ — pricing, current availability, and the project-specific delivery slot are all confirmed at quote time. No factory-direct or authorized-channel claim is made on this page.