Delta VFD007B21A | VFD-B Series AC Drive | 0.75kW 220V | Brand New In Box

The VFD007B21A is one of Delta's most widely deployed compact inverters — proven on thousands of production lines worldwide for its reliability, precise speed control, and no-nonsense commissioning. This listing is for a brand new, factory-sealed unit ready for immediate dispatch.

At a Glance


Brand	Delta Electronics
Model	VFD007B21A
Series	VFD-B
Power	0.75 kW (1 HP)
Input Voltage	200–240V AC (1-phase or 3-phase)
Output	3-phase, 0–240V AC
Output Current	4.2A
Frequency Range	0.1–400 Hz
Control Method	V/F (Volts per Hertz)
Protection Rating	IP20
Condition	Brand New, Factory Sealed
Stock	In Stock – Ships in 1–3 Days

Who Is This Drive For?

The VFD007B21A is the right choice if you need a compact, reliable 0.75kW AC variable frequency drive for single or three-phase 220V applications. It's particularly well suited for:

Maintenance engineers replacing a failed VFD-B unit on an existing machine
OEM machine builders integrating a proven, cost-effective drive into new equipment
System integrators looking for a compact Delta drive that commissions quickly and performs consistently
Procurement teams sourcing a genuine factory-new unit with fast delivery

If your motor is rated at 0.75kW (1HP) and your supply is 220V, the VFD007B21A is a direct, out-of-box solution.

Full Technical Specifications

Parameter	Specification
Manufacturer	Delta Electronics
Model Number	VFD007B21A
Drive Series	VFD-B
Rated Motor Power	0.75 kW / 1 HP
Input Voltage	200–240V AC
Input Phase	Single-phase or 3-phase
Input Frequency	50 / 60 Hz
Output Voltage	3-phase, 0–240V AC
Rated Output Current	4.2A
Output Frequency Range	0.1–400 Hz
Carrier Frequency	1–15 kHz (adjustable)
Control Method	V/F Control
Overload Capacity	150% rated current for 60 seconds
Starting Torque	150% at 3 Hz
Motor Type	AC induction motor (IM)
Braking	DC braking built-in
Protection Class	IP20 (open frame)
Cooling Method	Built-in forced air fan
Mounting	Panel mount (flange or through-hole)
Operating Temperature	-10°C to +50°C
Storage Temperature	-20°C to +60°C
Humidity	90% RH max (non-condensing)
Altitude	Up to 1,000m (derate above)
Certifications	CE, UL, cUL
Condition	Brand New, Factory Sealed

What Makes the VFD-B Series Stand Out

Delta's VFD-B series has been a workhorse in industrial automation for good reason. Here's what engineers consistently appreciate about the VFD007B21A:

Flexible Input — Single or Three Phase Unlike some compact VFDs that require a dedicated 3-phase supply, the VFD007B21A accepts both single-phase and three-phase 200–240V input. This makes it equally at home in light industrial, commercial, and workshop environments where only single-phase supply is available.

Wide Output Frequency Range — 0.1 to 400 Hz The broad frequency output range enables fine-speed control at the low end (useful for precise positioning or slow conveying) and high-speed operation up to 400 Hz for spindle or high-speed fan applications that standard 60Hz drives can't support.

150% Overload for 60 Seconds High inertia loads — like a fully loaded conveyor at startup or a pump priming against back pressure — demand overload headroom. The VFD007B21A handles 150% of rated current for a full minute, protecting both the drive and the motor during demanding start conditions.

Built-in DC Braking The integrated DC braking function allows controlled stopping of the motor without external braking resistors in most light-duty applications, reducing both cost and cabinet complexity.

Adjustable Carrier Frequency Carrier frequency adjustable from 1 to 15 kHz lets you balance motor noise (higher carrier = quieter motor) against drive heat dissipation (lower carrier = cooler drive) — a practical advantage in noise-sensitive or thermally constrained installations.

Real-World Applications

The VFD007B21A is regularly deployed across a wide range of industries and machine types:

Conveyors & Material Handling — Speed control for belt conveyors, roller tables, and part feeders in assembly and packaging lines. The smooth acceleration ramp prevents belt shock and reduces wear on mechanical components.

Pumps & Fans — Variable-speed control for small circulation pumps, cooling fans, and ventilation systems. Running at reduced speed during partial-load conditions significantly cuts energy consumption compared to on/off switching.

Packaging Machinery — Precise speed matching between different conveyor sections and sealing stations in pouch, box, and bottle packaging lines where synchronized motion is critical.

Small CNC & Woodworking Equipment — Spindle speed control on small lathes, routers, and mills where the 400 Hz output frequency supports high-speed cutting operations.

HVAC Auxiliary Systems — Controls damper actuator motors, exhaust fans, and supply air blowers in building automation and industrial HVAC systems.

Food & Beverage Processing — Hygienic-rated compatible motor control for mixers, conveyors, and filling stations where smooth, adjustable speed is needed.

VFD-B Series Model Comparison — Choose the Right Size

Model	Power	Output Current	Best For
VFD005B21A	0.4 kW (0.5 HP)	2.3A	Mini fans, small lab equipment
VFD007B21A	0.75 kW (1 HP)	4.2A	Conveyors, small pumps, packaging ✅
VFD015B21A	1.5 kW (2 HP)	7.5A	Heavier pumps, compressors
VFD022B21A	2.2 kW (3 HP)	11A	Medium-duty machinery

Selection tip: Always size your inverter based on the motor's rated current (amps), not just the kW rating. If your motor nameplate shows a current close to 4.2A, the VFD007B21A is the correct match. If the motor current regularly reaches or exceeds 4.2A under load, consider stepping up to the VFD015B21A.

Ordering With Confidence

We understand that buying industrial automation components online — especially from an international supplier — requires trust. Here's what we offer every customer:

✅ Brand New, Factory Sealed — Original Delta packaging, never opened or installed
✅ In Stock — Dispatches within 1–3 business days
✅ Worldwide Shipping — Tracked delivery to over 100 countries
✅ Genuine Delta Product — Not grey market, refurbished, or counterfeit
✅ 15+ Years Industry Experience — Specialized in industrial drives and automation components
✅ Pre-Sale Technical Support — Our team answers compatibility and wiring questions before you buy

FAQ — Delta VFD007B21A AC Inverter

Q1: What is the Delta VFD007B21A and what does it do? The VFD007B21A is a 0.75kW (1HP), 220V class variable frequency drive (VFD) from Delta Electronics' VFD-B series. It converts fixed-frequency AC power into a variable-frequency, variable-voltage output to control the speed and torque of an AC induction motor. By adjusting output frequency, the drive allows you to precisely control motor speed from near-zero to above rated speed, improving process control, reducing energy consumption, and protecting mechanical equipment from shock starts.

Q2: Can the VFD007B21A run from a single-phase supply? Yes. The VFD007B21A accepts both single-phase (1Ø) and three-phase (3Ø) input at 200–240V AC. This makes it particularly versatile in environments where only single-phase supply is available, while still delivering a clean three-phase output to the connected motor.

Q3: What size motor can the VFD007B21A drive? The VFD007B21A is rated for a 0.75kW (1HP) motor with a maximum continuous output current of 4.2A. When selecting a drive, always cross-check the motor's nameplate current (FLA) against the drive's rated output current. If the motor's full-load amps are at or below 4.2A, the VFD007B21A is the correct match.

Q4: What control method does the VFD007B21A use? The VFD007B21A uses V/F (Volts per Hertz) control, which maintains a constant voltage-to-frequency ratio across the speed range. This method is well-suited to constant-torque applications like conveyors and general-purpose variable-torque applications like fans and pumps. It does not support sensorless vector (SVC) or closed-loop vector control — if your application demands very precise torque control at low speeds, consider Delta's VFD-E or VFD-C2000 series instead.

Q5: What is the output frequency range? The VFD007B21A outputs from 0.1 Hz to 400 Hz, providing a very wide speed range. Standard 4-pole motor synchronous speed at 60Hz is 1800 RPM; at 400Hz output, the same motor would spin at up to 12,000 RPM (subject to motor design limits). This makes it suitable for spindle applications in addition to standard conveyor and pump uses.

Q6: Does the VFD007B21A have built-in braking? Yes, it includes built-in DC injection braking, which can be configured to engage at a set frequency during deceleration to bring the motor to a controlled stop. For applications requiring fast regenerative braking or those with high-inertia loads, an external braking resistor can be connected to improve stopping performance.

Q7: What protections are built into the VFD007B21A? The drive includes over-current protection, over-voltage protection, under-voltage protection, overheating protection, short-circuit protection, and ground fault protection. These safeguard both the drive and the connected motor from the most common fault conditions in industrial environments.

Q8: Is this a genuine new unit or a refurbished drive? This is a 100% brand new, factory-sealed Delta Electronics unit. It comes in original Delta packaging with all accessories. We do not supply refurbished, repaired, or grey-market units.

Q9: Is the VFD007B21A in stock and how fast will it ship? Yes, it is in stock. We typically dispatch within 1–3 business days. Estimated international delivery is 5–12 business days depending on your location. Express DHL/FedEx options are available — contact us if you have an urgent requirement.

Q10: What is the difference between VFD007B21A and VFD007B23A? The suffix indicates the input voltage class. The VFD007B21A is a 200–240V (220V class) model for single or three-phase supply. The VFD007B23A is a 380–480V (400V class) model for three-phase supply. Both are 0.75kW drives in the VFD-B series but are NOT interchangeable due to the different voltage ratings. Always confirm your supply voltage before ordering.

Q11: Can I get technical support or a wiring diagram? Yes. Our team can provide wiring guidance, parameter setup advice, and application support before and after purchase. Contact us via WhatsApp (+86 186 2050 5228) or email at amy2013@topsdevice.com. Delta's official VFD-B user manual is also publicly available from Delta's website for detailed parameter programming instructions.

Q12: What warranty and return policy applies? All products are covered under our standard warranty. Visit our Refund Policy page for full details, or contact our support team directly for any post-purchase assistance.

VFD007B21A Delta Inverter 0.75KW 220V VFD007B21A New In Box