What supply voltage and frequency does each use?

Rated voltage — Wistar motor WSM50 · 20 Nm · 33 rpm: 120 V; Wistar motor WSM50 · 20 Nm · 21 rpm: 120 V. Mains frequency — Wistar motor WSM50 · 20 Nm · 33 rpm: 60 Hz; Wistar motor WSM50 · 20 Nm · 21 rpm: 60 Hz. Power supply type — Wistar motor WSM50 · 20 Nm · 33 rpm: AC mains; Wistar motor WSM50 · 20 Nm · 21 rpm: AC mains.

Which tube diameters do they fit?

Motor diameter — Wistar motor WSM50 · 20 Nm · 33 rpm: 45 mm; Wistar motor WSM50 · 20 Nm · 21 rpm: 45 mm.

What torque and speed is each rated for?

Rated torque — Wistar motor WSM50 · 20 Nm · 33 rpm: 20 Nm; Wistar motor WSM50 · 20 Nm · 21 rpm: 20 Nm. Rated speed — Wistar motor WSM50 · 20 Nm · 33 rpm: 33 rpm; Wistar motor WSM50 · 20 Nm · 21 rpm: 21 rpm.

What protocols and control options does each support?

Limit setting — Wistar motor WSM50 · 20 Nm · 33 rpm: Mechanical; Wistar motor WSM50 · 20 Nm · 21 rpm: Mechanical.

Wistar motor WSM50 · 20 Nm: 33 rpm vs 21 rpm Compared

Rated power input — Wistar motor WSM50 · 20 Nm · 33 rpm: 280 W^{[1; 2026-10-01]}; Wistar motor WSM50 · 20 Nm · 21 rpm: 186 W^{[1; 2026-10-01]}.

Rated current — Wistar motor WSM50 · 20 Nm · 33 rpm: 2.4 A^{[1; 2026-10-01]}; Wistar motor WSM50 · 20 Nm · 21 rpm: 1.6 A^{[1; 2026-10-01]}.

Rated speed — Wistar motor WSM50 · 20 Nm · 33 rpm^{[1; 2026-10-01]}: 33 rpm; Wistar motor WSM50 · 20 Nm · 21 rpm^{[1; 2026-10-01]}: 21 rpm.

Last verified: 2026-10-01

When to choose Wistar motor WSM50 · 20 Nm · 33 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 WSM50 · 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]}.

Verifiable indicators

Short-time duty (S2) — Wistar motor WSM50 · 20 Nm · 33 rpm: 4 min^{[1; 2026-10-01]}; Wistar motor WSM50 · 20 Nm · 21 rpm: 4 min^{[1; 2026-10-01]}.

Rated life — Wistar motor WSM50 · 20 Nm · 33 rpm: Not published. Wistar motor WSM50 · 20 Nm · 21 rpm: Not published.

Thermal protection — Wistar motor WSM50 · 20 Nm · 33 rpm: Not published. Wistar motor WSM50 · 20 Nm · 21 rpm: Not published.

IP rating — Wistar motor WSM50 · 20 Nm · 33 rpm: IP44^{[1; 2026-10-01]}; Wistar motor WSM50 · 20 Nm · 21 rpm: IP44^{[1; 2026-10-01]}.

Comparison table
Property	Wistar motor WSM50 · 20 Nm · 33 rpmWistar motorWSM50-20/33	Wistar motor WSM50 · 20 Nm · 21 rpmWistar motorWSM50-20/21
Series & variant axes
Series	WSM50	WSM50
Electrical
Rated voltage	120 V^{[1; 2026-10-01]}	120 V^{[1; 2026-10-01]}
Mains frequency	60 Hz^{[1; 2026-10-01]}	60 Hz^{[1; 2026-10-01]}
Power supply type	AC mains^{[1; 2026-10-01]}	AC mains^{[1; 2026-10-01]}
Rated power inputDiffers: 280 W^{[1; 2026-10-01]} vs 186 W^{[1; 2026-10-01]}	280 W^{[1; 2026-10-01]}	186 W^{[1; 2026-10-01]}
Rated currentDiffers: 2.4 A^{[1; 2026-10-01]} vs 1.6 A^{[1; 2026-10-01]}	2.4 A^{[1; 2026-10-01]}	1.6 A^{[1; 2026-10-01]}
Drive performance
Rated torque	20 Nm^{[1; 2026-10-01]}	20 Nm^{[1; 2026-10-01]}
Rated speedDiffers: 33 rpm^{[1; 2026-10-01]} vs 21 rpm^{[1; 2026-10-01]}	33 rpm^{[1; 2026-10-01]}	21 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]}
Overall length	630 mm^{[1; 2026-10-01]}	630 mm^{[1; 2026-10-01]}
Weight	3 kg^{[1; 2026-10-01]}	3 kg^{[1; 2026-10-01]}
Limits & protection
Limit setting	Mechanical^{[1; 2026-10-01]}	Mechanical^{[1; 2026-10-01]}
Limit range	27 turns^{[1; 2026-10-01]}	27 turns^{[1; 2026-10-01]}
Environment & protection
IP rating	IP44^{[1; 2026-10-01]}	IP44^{[1; 2026-10-01]}
View all 30 variants
Documents	Request datasheet	Request datasheet

Relations and interchangeability

Wistar motor WSM50 · 20 Nm · 33 rpm → Wistar motor WSM50 · 20 Nm · 21 rpm

Not directly interchangeable

Same product type (tubular motor)
Ø45 mm (same class)
Torque 20 Nm (same)
120 V (same)
Power supply AC mains (same)
Mains 60 Hz (same)
Limits: Mechanical (same)
Length 630 mm
Limit turns 27
Protection IP44
Speed 21 rpm vs 33 rpm
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 WSM50 · 20 Nm · 21 rpm → Wistar motor WSM50 · 20 Nm · 33 rpm