What supply voltage and frequency does each use?

Rated voltage — Wistar motor WSS50 · 20 Nm · 21 rpm: 120 V; Wistar motor WSS50 · 20 Nm · 28 rpm: 230 V. Mains frequency — Wistar motor WSS50 · 20 Nm · 21 rpm: 60 Hz; Wistar motor WSS50 · 20 Nm · 28 rpm: 50 Hz. Power supply type — Wistar motor WSS50 · 20 Nm · 21 rpm: AC mains; Wistar motor WSS50 · 20 Nm · 28 rpm: AC mains.

Which tube diameters do they fit?

Motor diameter — Wistar motor WSS50 · 20 Nm · 21 rpm: 45 mm; Wistar motor WSS50 · 20 Nm · 28 rpm: 45 mm.

What torque and speed is each rated for?

Rated torque — Wistar motor WSS50 · 20 Nm · 21 rpm: 20 Nm; Wistar motor WSS50 · 20 Nm · 28 rpm: 20 Nm. Rated speed — Wistar motor WSS50 · 20 Nm · 21 rpm: 21 rpm; Wistar motor WSS50 · 20 Nm · 28 rpm: 28 rpm.

What protocols and control options does each support?

Limit setting — Wistar motor WSS50 · 20 Nm · 21 rpm: Mechanical; Wistar motor WSS50 · 20 Nm · 28 rpm: Mechanical.

Wistar motor WSS50 · 20 Nm: 21 rpm vs 28 rpm Compared

Rated voltage — Wistar motor WSS50 · 20 Nm · 21 rpm: 120 V^{[1; 2026-10-01]}; Wistar motor WSS50 · 20 Nm · 28 rpm: 230 V^{[1; 2026-10-01]}.

Rated power input — Wistar motor WSS50 · 20 Nm · 21 rpm: 186 W^{[1; 2026-10-01]}; Wistar motor WSS50 · 20 Nm · 28 rpm: 226 W^{[1; 2026-10-01]}.

Rated current — Wistar motor WSS50 · 20 Nm · 21 rpm: 1.6 A^{[1; 2026-10-01]}; Wistar motor WSS50 · 20 Nm · 28 rpm: 1.06 A^{[1; 2026-10-01]}.

Last verified: 2026-10-01

When to choose Wistar motor WSS50 · 20 Nm · 21 rpm

For 120 V^{[1; 2026-10-01]} / 60 Hz^{[1; 2026-10-01]} mains.
For the stated supply type: AC mains^{[1; 2026-10-01]}.
For the stated diameter: 45 mm^{[1; 2026-10-01]}.
For a rated torque of 20 Nm^{[1; 2026-10-01]}.

When to choose Wistar motor WSS50 · 20 Nm · 28 rpm

For 230 V^{[1; 2026-10-01]} / 50 Hz^{[1; 2026-10-01]} mains.
For the stated supply type: AC mains^{[1; 2026-10-01]}.
For the stated diameter: 45 mm^{[1; 2026-10-01]}.
For a rated torque of 20 Nm^{[1; 2026-10-01]}.

Verifiable indicators

Short-time duty (S2) — Wistar motor WSS50 · 20 Nm · 21 rpm: 4 min^{[1; 2026-10-01]}; Wistar motor WSS50 · 20 Nm · 28 rpm: 4 min^{[1; 2026-10-01]}.

Rated life — Wistar motor WSS50 · 20 Nm · 21 rpm: Not published. Wistar motor WSS50 · 20 Nm · 28 rpm: Not published.

Thermal protection — Wistar motor WSS50 · 20 Nm · 21 rpm: Not published. Wistar motor WSS50 · 20 Nm · 28 rpm: Not published.

IP rating — Wistar motor WSS50 · 20 Nm · 21 rpm: Not published. Wistar motor WSS50 · 20 Nm · 28 rpm: Not published.

Comparison table
Property	Wistar motor WSS50 · 20 Nm · 21 rpmWistar motorWSS50-20/21	Wistar motor WSS50 · 20 Nm · 28 rpmWistar motorWSS50-20/27
Series & variant axes
Series	WSS50	WSS50
Electrical
Rated voltageDiffers: 120 V^{[1; 2026-10-01]} vs 230 V^{[1; 2026-10-01]}	120 V^{[1; 2026-10-01]}	230 V^{[1; 2026-10-01]}
Mains frequencyDiffers: 60 Hz^{[1; 2026-10-01]} vs 50 Hz^{[1; 2026-10-01]}	60 Hz^{[1; 2026-10-01]}	50 Hz^{[1; 2026-10-01]}
Power supply type	AC mains^{[1; 2026-10-01]}	AC mains^{[1; 2026-10-01]}
Rated power inputDiffers: 186 W^{[1; 2026-10-01]} vs 226 W^{[1; 2026-10-01]}	186 W^{[1; 2026-10-01]}	226 W^{[1; 2026-10-01]}
Rated currentDiffers: 1.6 A^{[1; 2026-10-01]} vs 1.06 A^{[1; 2026-10-01]}	1.6 A^{[1; 2026-10-01]}	1.06 A^{[1; 2026-10-01]}
Drive performance
Rated torque	20 Nm^{[1; 2026-10-01]}	20 Nm^{[1; 2026-10-01]}
Rated speedDiffers: 21 rpm^{[1; 2026-10-01]} vs 28 rpm^{[1; 2026-10-01]}	21 rpm^{[1; 2026-10-01]}	28 rpm^{[1; 2026-10-01]}
Short-time duty (S2)	4 min^{[1; 2026-10-01]}	4 min^{[1; 2026-10-01]}
Dimensions & mounting
Motor diameter	45 mm^{[1; 2026-10-01]}	45 mm^{[1; 2026-10-01]}
WeightDiffers: 2.3 kg^{[1; 2026-10-01]} vs 2.43 kg^{[1; 2026-10-01]}	2.3 kg^{[1; 2026-10-01]}	2.43 kg^{[1; 2026-10-01]}
Limits & protection
Limit setting	Mechanical^{[1; 2026-10-01]}	Mechanical^{[1; 2026-10-01]}
View all 32 variants
Documents	Request datasheet	Request datasheet

Relations and interchangeability

Wistar motor WSS50 · 20 Nm · 21 rpm → Wistar motor WSS50 · 20 Nm · 28 rpm

Not directly interchangeable

Same product type (tubular motor)
Ø45 mm (same class)
Torque 20 Nm (same)
Power supply AC mains (same)
Limits: Mechanical (same)
Speed 28 rpm vs 21 rpm
230 V vs 120 V
Mains 50 Hz vs 60 Hz
Control system not confirmed

Required changes / checks: Control system not confirmed

Not checked: crown & drive adapters and motor head; Not checked: brackets; Not checked: remote pairing; Not checked: wiring

Wistar motor WSS50 · 20 Nm · 28 rpm → Wistar motor WSS50 · 20 Nm · 21 rpm

Not directly interchangeable

Same product type (tubular motor)
Ø45 mm (same class)
Torque 20 Nm (same)
Power supply AC mains (same)
Limits: Mechanical (same)
120 V vs 230 V
Mains 60 Hz vs 50 Hz
Opens/closes slower (≈25%)
Control system not confirmed

Required changes / checks: Opens/closes slower (≈25%); Control system not confirmed

Not checked: crown & drive adapters and motor head; Not checked: brackets; Not checked: remote pairing; Not checked: wiring

Cross-brand alternatives

Becker R20-17-EVO 20 R PLUS BT: 20 Nm^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}, Ø 45 mm^{[Becker-Antriebe product centre (product catalog); 2026-10-01]}, 230 V^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}
Becker R20-17-C01 PLUS: 20 Nm^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}, Ø 45 mm^{[Becker-Antriebe product centre (product catalog); 2026-10-01]}, 230 V^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}
Becker R20-17-D01: 20 Nm^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}, Ø 45 mm^{[Becker-Antriebe product centre (product catalog); 2026-10-01]}, 230 V^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}
Becker R20-17-EVO 20 R BT: 20 Nm^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}, Ø 45 mm^{[Becker-Antriebe product centre (product catalog); 2026-10-01]}, 230 V^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}
Becker R20-17 EVO 20 R: 20 Nm^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}, Ø 45 mm^{[Becker-Antriebe product centre (product catalog); 2026-10-01]}, 230 V^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}
Becker R20-17-E01: 20 Nm^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}, Ø 45 mm^{[Becker-Antriebe product centre (product catalog); 2026-10-01]}, 230 V^{[Becker-Antriebe GmbH PDF catalogue Gesamtkatalog__4995_800_000_0__Einzelseiten_D.pdf; 2026-10-03]}

Data gaps

Wistar motor WSS50 · 20 Nm · 21 rpm: Overall length — Not yet collected
Wistar motor WSS50 · 20 Nm · 28 rpm: Overall length — Not yet collected
Wistar motor WSS50 · 20 Nm · 21 rpm: Limit range — Not yet collected
Wistar motor WSS50 · 20 Nm · 28 rpm: Limit range — Not yet collected

Questions and answers

What supply voltage and frequency does each use?: Rated voltage — Wistar motor WSS50 · 20 Nm · 21 rpm: 120 V; Wistar motor WSS50 · 20 Nm · 28 rpm: 230 V. Mains frequency — Wistar motor WSS50 · 20 Nm · 21 rpm: 60 Hz; Wistar motor WSS50 · 20 Nm · 28 rpm: 50 Hz. Power supply type — Wistar motor WSS50 · 20 Nm · 21 rpm: AC mains; Wistar motor WSS50 · 20 Nm · 28 rpm: AC mains.
Which tube diameters do they fit?: Motor diameter — Wistar motor WSS50 · 20 Nm · 21 rpm: 45 mm; Wistar motor WSS50 · 20 Nm · 28 rpm: 45 mm.
What torque and speed is each rated for?: Rated torque — Wistar motor WSS50 · 20 Nm · 21 rpm: 20 Nm; Wistar motor WSS50 · 20 Nm · 28 rpm: 20 Nm. Rated speed — Wistar motor WSS50 · 20 Nm · 21 rpm: 21 rpm; Wistar motor WSS50 · 20 Nm · 28 rpm: 28 rpm.
What protocols and control options does each support?: Limit setting — Wistar motor WSS50 · 20 Nm · 21 rpm: Mechanical; Wistar motor WSS50 · 20 Nm · 28 rpm: Mechanical.

Sources

↑Wistar motor manufacturer site (product catalog)wistarmotor.comSeries / product line: Ref: WSS50Manufacturer-stated · Observed 2026-10-01 · Retrieved 2026-10-01 · Public web pageUsed for: 20098, 19732, 20089, 19721, 20097, 19730, 20081, 19717, 20087, 19720, 20091, 19723, 20077, 19715, 20079, 19716, 20093, 19725, 20083, 19718, 20095, 19728, 20099, 19734

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Wistar motor WSS50 · 20 Nm · 21 rpm vs Wistar motor WSS50 · 20 Nm · 28 rpm